JP2011145265A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital panel meter displaying a numerical value to be displayed, in a proper display state. <P>SOLUTION: A digital panel meter of the 48×96 class adopting a conventional full-dot matrix system has a limited application because the number of digits to be displayed is restricted from a relation of a font set, and it is difficult hitherto to use it in common, for application for voltage value measurement and a counter in which numerical values are increased infinitely and the number of digits is increased. In the panel meter, when the number of digits to be displayed becomes short according to user setting or to a measurement content automatically, a font size is reduced or the number of digits to be displayed is increased, to thereby display a numerical value having the large number of digits with high visibility. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a display device.
More specifically, the present invention relates to a digital panel meter that displays digital values after digital processing of analog signals and / or pulse signals.

  Digital panel meters conforming to the DIN standard are frequently used in manufacturing sites such as factories and various measurement sites. Patent Document 1 is shown as a prior art document of a general digital panel meter.

JP 2002-116063 A

The 48mm x 96mm class digital panel meters used so far, even those using 7-segment LEDs or liquid crystals, are those with a fixed number of digits, and their fonts are constant, so the meaning of the display is expressed in various ways. There were only things that could not be done. For this reason, it has been difficult to properly display various input signal states.
For example, it is assumed that there are two input signals, one signal is a voltage, and the other signal is a count value. The voltage signal does not need to take into account a large number of digits including the decimal point due to the accuracy, but the signal for counting purposes does not need to display the numerical value after the decimal point, but the number of digits is not limited. is there. In the case of such a combination of signals, it is possible that the number of digits of the numerical value that must be displayed is significantly different. Not only that, in the case of counting applications, in addition to changing the display color for the display when the target penalty value is exceeded, various expressions can be made to change the font freely and call attention. There wasn't.

Even if only focusing on the number of digits, in the case of a fixed number of digits, if the product specifications of the digital panel meter are adjusted to a small number of display digits, a problem that a number with a large number of display digits cannot be displayed correctly occurs.
On the other hand, if the product specifications of the digital panel meter are adjusted to a large number of display digits, the number will be smaller than necessary even for applications with a small number of required digits when displaying a small number of display digits. This causes a malfunction.

  An object of the present invention is to solve the problem and provide a display device capable of displaying numerical values to be displayed in an appropriate display state.

  In order to solve the above problems, the display device of the present invention is a 48 meter × 96 mm class panel meter display device having a full dot matrix display mounted on a control panel or the like for instrumentation. A display system that does not limit the expression means including the font, the number of digits, the number of lines, and the analog graph is adopted, including the user's ability to change freely according to the contents.

  In order to solve the above problems, a digital panel meter according to the present invention includes a dot matrix format display unit, a measurement signal interface for measuring an input signal and outputting measurement data, and a digit for displaying the measurement data. A display control unit that selects and displays an appropriate font according to the number and the number of lines.

  In order to solve the above problems, a digital panel meter according to the present invention includes a dot-matrix display unit, a first measurement signal interface that measures an input signal and outputs first measurement data, and a first measurement signal interface. A number identification part for counting the number of digits of the integer part and the number of decimal parts of the measurement data, a first font capable of displaying the first digit number and the first line number on the display part, and the display part A font table having a second number of digits greater than the first number of digits and a second font capable of displaying a second number of rows greater than the first number of rows, and the digits of the integer part from the digit number identification unit Receives information on the number of digits and the number of decimal places, calculates whether the first measurement data can be displayed on the display with the first font, and if it can be displayed, selects the first font and cannot display it If so, select the second font and select the font A display content creation unit that creates display data for displaying the first measurement data on the display unit using the font selected by the selection unit, and display data created by the display content creation unit is displayed on the display unit. A display control unit.

  Furthermore, the digital panel meter of the present invention includes an option storage unit that stores a user's setting value, and the font selection unit is information that the setting value stored in the option storage unit prioritizes the number of display lines. In this case, before selecting a font from the first font to the second font, the number of numerical lines displayed on the display unit by the first font is increased.

  Furthermore, the digital panel meter of the present invention includes a unit conversion unit that performs predetermined unit conversion processing on the first measurement data according to the setting content stored in the option storage unit, and the display content creation unit includes the option storage unit. Display data indicating the unit accompanying the unit conversion process is created in accordance with the setting contents stored in.

  Furthermore, the display control unit of the digital panel meter of the present invention can display the moving image data input from the outside so as to overlap the display data.

  Furthermore, the digital panel meter of the present invention includes a second measurement signal interface that measures an input signal and outputs second measurement data, and the display content creation unit includes the display unit as the first region and the second region. The first measurement data is divided into areas and the first measurement data is displayed on the first area using the first font, and the second measurement data is generated using the second font. Second display data to be displayed in the second area is created, and the first display data and the second display data are sent to the display control unit.

  Further, the first font of the digital panel meter of the present invention is a numeric font having a first height, a period font having a second height smaller than the first height, Draw a period font in the space between adjacent numeric fonts.

  In place of the conventional fixed font, a plurality of fonts are installed so that the font used for numerical display can be freely selected. When the number of display digits of the measured value is insufficient, the font size can be reduced or the number of display lines can be increased to display a numerical value with a large number of digits with high visibility.

  According to the present invention, it is possible to provide a display device that can display numerical values to be displayed in an appropriate display state.

It is an external appearance perspective view of a digital panel meter Example. It is a block diagram which shows the hardware constitutions of a digital panel meter Example. It is a functional block diagram of a digital panel meter embodiment. It is a figure which shows a font table. It is a figure which shows an example of the font displayed on color LCD. It is a figure which shows an example of the font displayed on color LCD. It is a figure explaining a decimal point display and a comma display. It is a flowchart explaining an example of the flow of the font selection process which a font selection part performs. It is a flowchart explaining an example of the flow of the font variable display process which a font selection part performs. It is a figure which shows an example of the display state of color LCD when the display font of a fraction part is made small. It is a figure explaining the example of a mode that a display state differs before and after a measured value exceeds a threshold value. It is a figure explaining the state which converts and displays the same input data in a different unit.

FIG. 1 is an external perspective view of a digital panel meter.
The digital panel meter 101 includes a front panel 102 that is 48 mm long and 96 mm wide that conforms to the DIN standard, and a housing 103 that houses a predetermined electronic circuit.
The front panel 102 is covered with a transparent acrylic resin. The front panel 102 is provided with eleven number keys 104 on the lower side and five function keys 105 on the right side. The area surrounded by the number keys 104 and the function keys 105 has a display area 106. Is provided. A color LCD (Liquid Crystal Display) 107 is embedded in the display area 106.
A large number of input terminals (not shown) are provided on the back surface of the housing 103.

  The color LCD 107 is a known dot matrix type liquid crystal display device. Unlike conventional 7-segment LED display tubes, fonts and similar image data are used to display numbers.

FIG. 2 is a block diagram showing a hardware configuration of the digital panel meter 101.
The digital panel meter 101 is composed of a known microcomputer. A CPU 201, EEPROM 202, and RAM 203, which are main components of the microcomputer, are connected to the internal bus 204. An LCD display unit 205 which is a color LCD 107 and an operation unit 206 which is numeric keys 104 and function keys 105 are also connected to the internal bus 204.

The CPU 201 is provided with a serial bus 207 separately from the internal bus 204. The serial bus 207 is, for example, a well-known I2C (I-Square C: Inter-Integrated Circuit). A first input module 208a, a second input module 208b, a third input module 208c, a fourth input module 208d, and a fifth input module 208e are connected to the serial bus 207. These input modules are interfaces that convert various input signals into numerical data to be displayed, and can also be called measurement signal interfaces.
For example, if the input signal is an analog signal, the input module performs A / D conversion via a built-in amplifier or attenuator and outputs the data to the CPU 201.
For example, if the input signal is a pulse signal, the input module counts the pulse signal with a built-in counter and outputs the data to the CPU 201.
For example, if the input signal is an AC signal and it is desired to measure the frequency, the input module measures the frequency with a built-in PLL and outputs the data to the CPU 201.

Except for the first input module 208a, the second input module 208b, the third input module 208c, the fourth input module 208d, and the fifth input module 208e are optional parts that can be added arbitrarily. The digital panel meter 101 of this embodiment is equipped with only the first input module 208a at the time of shipment from the factory, and the user adds the second input module 208b to the fifth input module 208e as required and necessary.
The first input module 208a, the second input module 208b, the third input module 208c, the fourth input module 208d, and the fifth input module 208e each have two input terminals. Therefore, the digital panel meter 101 of this embodiment accepts a maximum of 10 inputs.

  A USB interface 209 is connected to the internal bus 204. The USB interface 209 is provided for receiving moving image data from an external device and displaying the moving image on the LCD display unit 205 in a numerical value display. For example, there is an application such as displaying an image of a monitoring camera for photographing a belt conveyor in a factory so as to overlap with a measured value.

FIG. 3 is a functional block diagram of the digital panel meter 101. In this functional block diagram, the first input module 208a, the second input module 208b, the third input module 208c, the fourth input module 208d, and the fifth input module 208e are omitted for easy explanation.
The input selector 301 receives data sequentially from the first input module 208a to the fifth input module 208e connected to the serial bus 207 in a time division manner.
Data received from any of the first input module 208 a to the fifth input module 208 e through the input selector 301 is first input to the unit conversion unit 302. The unit conversion unit 302 performs unit conversion processing on the input data as necessary based on parameters stored in the option storage unit 303 set in the input data. For example, if the input data is meters and the unit of data to be displayed is feet, the input data is multiplied by “3.281”.
The option storage unit 303 is a specific area of the EEPROM 202. That is, the option storage unit 303 is a non-volatile storage for storing setting values set by the user.

  Data output from the unit conversion unit 302 is input to the rounding processing unit 304. The rounding processing unit 304 performs rounding processing to reduce the number of digits of the numerical value as necessary on the input data based on the parameters stored in the option storage unit 303 set in the input data. For example, if the integer part of the input data is 4 digits, the decimal part is 6 digits, and the number of digits that can be displayed on the LCD display unit 205 is 7 digits, the lower 3 digits of the decimal part are rounded off. Round down or round up.

Data output from the rounding processing unit 304 is input to the digit number identifying unit 305 and the display content creating unit 306. The digit number identifying unit 305 counts the number of digits in the integer part and the decimal part of the input data and outputs the digit number data.
The digit number data output by the digit number identifying unit 305 is input to the font selecting unit 307. The font selection unit 307 refers to the information described in the font table 308 based on the digit number data, selects an optimal font, and outputs information on the selected font to the display content creation unit 306. The font selection unit 307 functions as a changeover switch that selects one font from a plurality of fonts when viewed from the display content creation unit 306.

  The display content creation unit 306 renders input data in the font based on the font information output from the font selection unit 307. At this time, addition of a decimal point and drawing of a comma added every three digits are also executed based on the set value in the option storage unit 303. As a result of drawing by the display content creation unit 306, bitmap data representing a numerical value is created.

The bitmap data output from the display content creation unit 306 is input to the display control unit 309. Based on the parameters stored in the option storage unit 303, the display control unit 309 adds predetermined colors, decodes moving image data input through the USB interface 209, and displays an overlap display with a moving image. Execute.
The display screen data thus created by the display control unit 309 is displayed on the LCD display unit 205.

  Note that the operation mode control unit 310 receives operation information of the operation unit 206 in order to change the setting value stored in the option storage unit 303. The operation mode control unit 310 controls the display control unit 309 to execute switching from the normal display state to the option setting screen, and sets the setting value in the option storage unit 303 based on the operation information of the operation unit 206. change.

FIG. 4 is a diagram showing the font table 308.
The font table 308 includes a “font size” field, a “displayable number of digits” field, a “10-value display” field, a “4-value display” field, a “binary display” field, and a “decimal display font” field, which are not shown. A font data field is provided.

The “font size” field is the name of the font. This has the same value as the “decimal font” field described below.
The “displayable number of digits” field is the number of digits and the number of lines that can be displayed by the font.
The “10-value display” field is a flag field indicating whether the number of input data can be displayed. In the case of this embodiment, only a “16 * 8” font can display 10 values.
The “4-value display” field is a flag field indicating whether or not the number of input data can be displayed. In the case of the present embodiment, only “16 * 8” font is allowed to display 10 values.
The “binary display” field is a flag field indicating whether or not the number of input data can be displayed. In the present embodiment, binary display is permitted from “16 * 8” font to “104 * 52” font.
The “decimal display font” field describes the name of a font used when a font displayed in the decimal part described later is displayed in a font smaller than the font displayed in the integer part.

The notation “16 * 8” in the name of the font represents the number of dots constituting the font. If it is “16 * 8”, it is 16 dots vertically and 8 dots horizontally.
Further, the dots constituting the font and the pixels constituting the LCD display unit 205 do not necessarily match. In the case of an LCD capable of high-detail display, one dot constituting a font can be expressed by a plurality of pixels.

The font data field stores actual font data. In the case of this embodiment, it is bitmap data of numerals, alphabets, minus, periods, and commas.
Instead of providing the font data field, each font may be prepared as an independent file. The font is not necessarily a bitmap font, and may be a vector font.

The digital panel meter 101 according to the present embodiment includes four display modes, which are a one-value display mode, a two-value display mode, a four-value display mode, and a ten-value display mode, as modes for displaying measured values on the color LCD 107.
The single value display mode is a mode in which only one measurement value is displayed on the color LCD 107.
The binary display mode is a mode in which the color LCD 107 is divided into upper and lower parts and two measurement values are displayed.
The four-value display mode is a mode in which the color LCD 107 is vertically divided into four parts to display four measurement values.
The 10-value display mode is a mode for displaying ten measurement values by sufficiently dividing the color LCD 107 vertically.
Among these display modes, the one-value display mode and the binary display mode are display modes in which the font size can be changed according to the number of digits of the measurement value. On the contrary, the 4-value display mode and the 10-value display mode are display modes in which the font to be used is fixed with the “16 * 8” font having the minimum font size.

5 (a), (b), (c), (d), (e), (f) and (g) and FIGS. 6 (h), (i), (j), (k), ( l), (m), (n), and (o) are examples of fonts displayed on the color LCD 107. FIG.
FIG. 5A shows the display state of the “16 * 8” font.
As shown in FIG. 5A, the font can display a maximum of 39 columns and 10 lines. In the digital panel meter 101 of the present embodiment, only the “16 * 8” font can be used in all display modes.
FIG. 5B is a diagram showing a display state of the “24 * 12” font. As shown in FIG. 5B, the font is capable of displaying a maximum of 27 digits and 7 lines.
FIG. 5C shows the display state of the “32 * 16” font. As shown in FIG. 5C, the font is capable of displaying a maximum of 21 digits and 5 lines.
FIG. 5D shows the display state of the “40 * 20” font. As shown in FIG. 5D, the font can display a maximum of 16 digits and 4 lines.
FIG. 5E shows the display state of the “48 * 24” font. As shown in FIG. 5E, the font is capable of displaying a maximum of 14 digits and 3 lines.
FIG. 5F shows the display state of the “64 * 32” font. As shown in FIG. 5 (f), the font can be displayed in a maximum of 10 digits and 3 lines.
FIG. 5G shows the display state of the “72 * 36” font. As shown in FIG. 5G, the font can display a maximum of 9 digits and 2 lines.
FIG. 6H shows the display state of the “80 * 40” font. As shown in FIG. 6H, the font is capable of displaying a maximum of 8 digits and 2 lines.
FIG. 6I shows the display state of the “88 * 44” font. As shown in FIG. 6 (i), the font is capable of displaying a maximum of 8 digits and 2 lines.
FIG. 6J shows the display state of the “96 * 48” font. As shown in FIG. 6 (j), the font is capable of displaying a maximum of 7 digits and 2 lines.
FIG. 6K shows the display state of the “104 * 52” font. As shown in FIG. 5 (k), the font is capable of displaying a maximum of 7 digits and 2 lines.
FIG. 6L shows the display state of the “120 * 60” font. As shown in FIG. 5 (l), it is a font that can display a maximum of 6 digits per line.
FIG. 6M shows the display state of the “136 * 68” font. As shown in FIG. 5 (m), it is a font capable of displaying a maximum of 5 digits per line.
FIG. 6 (n) shows the display state of the “152 * 76” font. As shown in FIG. 5 (n), the font is capable of displaying a maximum of 5 digits per line.
FIG. 6 (o) is a diagram showing the display state of the “176 * 88” font. As shown in FIG. 5 (o), the font is capable of displaying a maximum of 4 digits per line.

FIG. 7 is a diagram for explaining decimal point display and comma display.
On the numeric display area 701, a dedicated comma display area 702 for displaying only a comma is provided. The comma displayed for every third digit is displayed in the comma display area 702.
In the space between the numbers in the number display area 701, a dedicated period display area 703 for displaying a period is provided, and a period indicating a decimal point is displayed in the period display area 703.
These display areas are created according to the font selected by the display content creation unit 306 by the font selection unit 307, and numbers, periods, and commas are drawn therein.

In particular, the digital panel meter 101 of the present embodiment has a dedicated period display area 703 for displaying a period while numeric fonts are adjacent to each other, unlike a font display method found on a general personal computer or the like. There are significant differences. The period is treated as a font of a size different from other numbers and alphabets. By configuring the font in this way, not only the limited display area of the color LCD 107 can be used effectively, but also the numerical value including the decimal point and the numerical value not including the decimal point can be handled as the same number of digits. Therefore, as compared with the numerical value display method using the conventional font, the numerical value including the decimal point does not need to be handled disadvantageously on the display.
This is advantageous in that it is not necessary to include considerations such as distinguishing the number of digits depending on whether or not a decimal point is included in the flowchart described later.

FIG. 8 is a flowchart for explaining the flow of font selection processing executed by the font selection unit 307.
When the process is started (S801), the font selection unit 307 reads the setting value stored in the option storage unit 303 to check whether or not the current display setting is only one value or two value display setting. (S802).
If the current display setting is only one value or binary display setting (YES in S802), the font variable display process is executed (S803), and the process is terminated (S804).
If the current display setting is a 4-value display setting or a 10-value display setting (NO in S802), the font is one of “16 * 8” fonts. (S805), the process ends (S804).

FIG. 9 is a flowchart for explaining the flow of font variable display processing executed by the font selection unit 307. This corresponds to the content of step S803 in FIG.
When the processing is started (S901), the font selection unit 307 first acquires the maximum font size, which is one of the setting values stored in the option storage unit 303, and sets “1” as the initial value of the number of display lines. Is set (S902). That is, in this step S902, the type of font used for displaying numerical values and the initial value of the number of lines are set.

Subsequent processing is loop processing.
Based on the digit number data received from the digit number identifying unit 305, the font selection unit 307 calculates the display width of what happens when the color LCD 107 displays the current font size and number of lines (S903). In addition, when displaying the font displayed in the decimal part described later in a font smaller than the font displayed in the integer part, the number of digits in the integer part is calculated with the current font size, and the number of digits in the decimal part is Based on the font size, the font table 308 is referred to, and the font size described in the “decimal display font” field of the font record in the font table 308 is used for calculation.
Next, the font selection unit 307 verifies whether or not the display width calculated in step S903 exceeds the display width of the color LCD 107, that is, whether or not display is possible (S904). If display is possible as it is (NO in S904), the font used for display is determined to be the current font size (S905), and the process is terminated (S906).

  If the current font size cannot be displayed in step S904 (YES in S904), the font selection unit 307 then displays one of the setting values stored in the option storage unit 303, “font or line number”. The value of the “priority setting” flag is checked (S907).

In step S907, if the value of the “font or line number priority setting” flag is set to “font priority” (YES in S907), the font selection unit 307 next determines whether the current font size is the minimum value. It is confirmed whether or not (S908). In this embodiment, the minimum font size corresponds to the “16 * 8” font shown in FIG.
If the current font size is not the minimum value (NO in S908), the current font size is changed to a size one rank lower (S909).
If the current font size is the minimum value (YES in S908), the font size cannot be reduced any further. Therefore, it is confirmed whether or not the current number of display lines is not the maximum value (S910). If the current number of display lines is not the maximum value (YES in S910), one display line is added (S911), and the display width is calculated again (S903).

  In step S910, if the current number of display lines is the maximum value (NO in S910), the number of display lines can no longer be increased. Therefore, the font selection unit 307 next looks at the value of the “error display or exponent display setting” flag, which is one of the setting values stored in the option storage unit 303, and displays an error display or display digit. Index display is performed within a range of numbers (S912). Then, the process ends (S906).

If the value of the “font or line number priority setting” flag is set to “line number priority” in step S907 (NO in S907), the font selection unit 307 next displays the current line number being currently selected. It is confirmed whether or not it is the maximum value in the font (S913).
If the current number of lines is not the maximum value (NO in S913), the current number of lines is increased by 1 (S911).
If the current number of lines is the maximum value (YES in S913), the number of lines cannot be increased any more. Therefore, it is confirmed whether or not the current font is not the minimum (S914). If the current font is not the minimum (YES in S914), the font size is changed to a size one rank lower (S909), and the display width is calculated again (S903).

  If the current font size is the smallest in step S914 (NO in S914), the font size can no longer be reduced. Therefore, the font selection unit 307 next looks at the value of the “error display or exponent display setting” flag, which is one of the setting values stored in the option storage unit 303, and displays an error display or display digit. Index display is performed within a range of numbers (S912). Then, the process ends (S906).

The digital panel meter 101 according to the present embodiment described so far is provided with the following setting values for changing the operation state of each functional block with respect to the display of the measurement values, and is stored in the option storage unit 303.
Unit conversion unit 302: Unit conversion constant, unit display Rounding processing unit 304: Decimal part significant digits, rounding down / rounding up / rounding off Font selection unit 307: default font, single value display mode / binary display mode / quaternary display mode / 10-value display mode, fractional font reduction,
Display content creation unit 306: Addition of commas, normal display color, threshold, threshold display color, font type, font design Display control unit 309: Presence or absence of video overlap

The digital panel meter 101 according to the present embodiment has various display functions in addition to the font size changing process described above.
(1) As described above, as one of the display functions, a function for displaying a font displayed in the decimal part with a font smaller than a font displayed in the integer part is provided.
FIG. 10 is a diagram showing a display state of the color LCD 107 when the display font of the decimal part is reduced. In FIG. 10, the font of the integer part is “120 * 60” font having 6 displayable digits, but the font of the decimal part is “80 *” in the “decimal display font” field of the font table 308 of FIG. 40 "font is used. For this reason, the number of digits displayed in the decimal part is increased by one.

(2) The display color and background color for numerical display can be freely set using the function of the LCD display unit 205 which is the color LCD 107. In addition to simply setting the display color, a predetermined threshold value can be stored in the option storage unit 303 in advance, and the display color can be changed when the measured value exceeds the threshold value.
FIGS. 11A and 11B are diagrams for explaining how the display state is different before and after the measured value exceeds the threshold value.
In FIG. 11A, the measured value is “123455” that does not exceed the threshold value “123455” set in advance, so that a black font is displayed on a white background.
In FIG. 11B, since the measured value exceeds “123456” with respect to the preset threshold value “123455”, a white font is displayed on a blue background.
As described above, the digital panel meter 101 according to the present embodiment can clearly represent not only the numerical value display but also the state with respect to the threshold value.

(3) By storing the predetermined multiplication value and the character of the unit to be displayed in the option storage unit 303, the unit conversion unit 302 performs a free and appropriate conversion process on the input data, and obtains the measurement value. Can be displayed.
FIGS. 12A, 12B, 12C, and 12D are diagrams illustrating a state in which the same input data is converted and displayed in different units and displayed.
When the data “1” is input and the function key 105 is pressed to select “meter display setting”, the color LCD 107 displays “1.00 m” as shown in FIG. Is displayed.
In this state, when the function key 105 is pressed to select “set foot display”, “3.281 ft” is displayed on the color LCD 107 as shown in FIG.
When the function key 105 is pressed to select “inch display setting”, “39.87 in” is displayed on the color LCD 107 as shown in FIG.
Further, when the function key 105 is pressed to select “yard display setting”, “1.094 yd” is displayed on the color LCD 107 as shown in FIG.
These conversion processes may be stored in the ROM in advance, or an arbitrary conversion coefficient and a character to be displayed can be set.

Further, this embodiment can be applied as follows.
(4) In FIGS. 11A and 11B, it is possible not only to change the display color of the font and the background, but also to change the font design with the threshold as a boundary. For example, when the threshold value is exceeded, change the font decoration, such as italic, bold, or white, or change the font itself from Gothic to Mincho, for example. It is also possible to change the type.

  (5) It is also conceivable to execute multi-value display in a time division manner. For example, the first input data and the second input data are alternately displayed on the color LCD 107 every second. Since the display state is a single value display mode while being multi-value display, it is excellent in terms of the number of display digits and visibility. In this case, in order to distinguish the type of value to be displayed, it is desirable to change the background color, font color, or font design as in the case of FIG.

In the present embodiment, a digital panel meter is disclosed.
A color LCD was used instead of the conventional 7-segment LED display tube. By adopting a color LCD, the font used for numerical display can be freely selected. Therefore, the digital panel meter according to the present embodiment increases the numerical value with a large number of digits by reducing the font size or increasing the number of display lines when the number of display digits is insufficient according to the user setting. It can be displayed with visibility.

  DESCRIPTION OF SYMBOLS 101 ... Digital panel meter, 102 ... Front panel, 103 ... Housing, 104 ... Number key, 105 ... Function key, 106 ... Display area, 107 ... Color LCD, 201 ... CPU, 202 ... EEPROM, 203 ... RAM, 204 ... Internal bus 205 ... LCD display unit 206 ... Operation unit 207 ... Serial bus 208a ... First input module 208b ... Second input module 208c ... Third input module 208d ... Fourth input module 208e ... No. Five input modules, 209 ... USB interface, 301 ... input selector, 302 ... unit conversion unit, 303 ... option storage unit, 304 ... processing unit, 305 ... digit number identification unit, 306 ... display content creation unit, 307 ... font selection unit 308 ... Font table 309 ... Display control unit 310 ... Operation mode De control unit, 701 ... numeral display area, 702 ... comma display area, 703 ... period display area

Claims (4)

  In a 48mm x 96mm class panel meter display device with a full dot matrix display mounted on a control panel or the like for instrumentation, including user-changeable according to the measurement contents to be displayed. , A display device adopting a display method that does not limit the expression means including font, number of digits, number of lines, and analog graph.   When the display unit is changed during operation, a conversion coefficient corresponding to the selected display unit is automatically selected, and the display numerical data can also be displayed as a value corresponding to the display unit. The display device according to 1.   The display device according to claim 1, wherein image data (including still images and moving images) can also be displayed.   The display device according to claim 1, wherein display data including two or more images can be displayed in an overlapping manner.

Images