JP2006007572A - Image forming device, control method and display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correctly display character strings inputted by the characters of a language inputted even if a displayed language in the operation display section of an image forming device is changed to a language different from the language inputted. <P>SOLUTION: In the image forming device 1, a leading character code of one byte is read from a character code of a character string to be displayed which is stored in an English display character code storage section or an input character code storage section, when a display language is changed to English in an English character string display control process, whether it is a Japanese character code or not is determined. When it is a Japanese character code, a subsequent character code of one byte is read, font data corresponding to a character code of two bytes read is read from a Japanese font data list and written to a VRAM and displayed in a prescribed display position on a display screen. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image forming apparatus having an operation display unit capable of selectively switching a display language, a control method thereof, and a display screen display method of the operation display unit.

  2. Description of the Related Art Conventionally, there has been known a technique that enables a display language on a display device to be selectively switched. For example, Patent Document 1 discloses a method of switching display to a plurality of languages in a computer system.

  In image forming apparatuses such as copying machines, printers, and facsimiles, apparatuses having an operation display unit capable of switching display languages have been put into practical use.

Generally, when a character string is displayed on the display screen of the operation display unit in the image forming apparatus, a font corresponding to the character code of the character string to be displayed is written in the VRAM, and the font written in the VRAM is displayed. Has been done. When the display language can be switched, the character code and font of the character string to be displayed for each display language are prepared. By switching the character code and font for the selected language, the selected display language can be selected. Can be displayed.
Japanese Patent Laid-Open No. 10-3372

  Incidentally, in recent years, character input from a display screen has become common in image forming apparatuses. FIG. 9 shows an example of a character input screen (Japanese character input screen) 123. FIG. 9 is a screen displayed for inputting a folder name. When “Sato” is input from this screen, if Japanese language display is selected, as shown in FIG. 10, “Sato” is displayed on the folder selection screen 124 that displays a list of folder names. Is displayed. However, when the display language is switched to a language other than Japanese, for example, English, the characters entered in Japanese are garbled and the entered characters are not displayed correctly as in the folder selection screen 125 shown in FIG. The problem arises.

  As described above, when a character string is displayed on the display screen of the operation display unit in the image forming apparatus, the character code of the character string to be displayed is uniformly replaced with a font representing the character of the selected display language. It is caused by displaying. For example, characters used in Japanese (Hiragana, Katakana, Kanji, numbers, symbols, symbols, etc., hereinafter referred to as Japanese characters) are defined by a 2-byte character code. 82A0 (hex) "is supported, but the characters used in English (Roman characters, numbers, symbols, symbols, etc., hereinafter referred to as English characters) are defined in 1 byte, so the display language In the English state, even if “A” is displayed, the character code “82A0 (hex)” of “A” is divided into “82 (hex)” and “A0 (hex)” and divided into 1 byte. However, two characters of “English” corresponding to the character code “82 (hex)” and English font corresponding to the character code “A0 (hex)”, which are different from “A”, are displayed. .

  The present invention has been made in view of the situation as described above, and even if the display language in the operation display unit of the image forming apparatus is switched to a language different from the language in which the characters are input, the input character strings are displayed. An object is to enable correct display of characters in the input language.

In order to solve the above-mentioned problem, the invention described in claim 1
In an image forming apparatus comprising: an operation display unit; and a language switching unit that selectively switches a display language displayed on the display screen of the operation display unit.
When a character used in the language switched by the language switching means is defined by a 1-byte character code, the operation is performed on a character in another language that uses a character defined by a 2-byte character code. It is characterized by comprising control means for displaying on the same display screen of the display unit.

The invention according to claim 2 is the invention according to claim 1,
Characters defined by the 2-byte character code are Japanese characters, simplified characters, traditional characters, or Korean characters.

The invention according to claim 3 is the invention according to claim 1 or 2,
The control means, when a character used in the language switched by the language switching means is defined by a 1-byte character code, a character to be displayed on the display screen defined by a 2-byte character code When the character cannot be displayed, the character is not displayed.

The invention according to claim 4 is the invention according to claim 1 or 2,
The control means, when a character used in the language switched by the language switching means is defined by a 1-byte character code, a character to be displayed on the display screen defined by a 2-byte character code When the character cannot be displayed, the character code corresponding to the character is converted into a predetermined character code, and the symbol or code corresponding to the converted character code is displayed.

The invention described in claim 5
A method for controlling the operation display unit in an image forming apparatus, comprising: an operation display unit; and a language switching unit that selectively switches a display language to be displayed on a display screen of the operation display unit,
When a character used in the language switched by the language switching means is defined by a 1-byte character code, the operation is performed on a character in another language that uses a character defined by a 2-byte character code. It is characterized by being displayed on the same display screen of the display unit.

The invention according to claim 6 is the invention according to claim 5,
Characters defined by the 2-byte character code are Japanese characters, simplified characters, traditional characters, or Korean characters.

The invention according to claim 7 is the invention according to claim 5 or 6,
When the character used in the language switched by the language switching means is defined by a 1-byte character code, the character to be displayed on the display screen defined by the 2-byte character code cannot be displayed. In some cases, the character is not displayed.

The invention according to claim 8 is the invention according to claim 5 or 6,
When the character used in the language switched by the language switching means is defined by a 1-byte character code, the character to be displayed on the display screen defined by the 2-byte character code cannot be displayed. In some cases, a character code corresponding to the character is converted into a predetermined character code, and a symbol or a code corresponding to the converted character code is displayed.

The invention according to claim 9 is:
A display method of a display screen of the operation display unit in an image forming apparatus comprising: an operation display unit; and a language switching unit that selectively switches a display language displayed on the display screen of the operation display unit,
When a character used in the language switched by the language switching means is defined by a 1-byte character code, the operation is performed on a character in another language that uses a character defined by a 2-byte character code. It displays on the same display screen of a display part.

The invention according to claim 10 is the invention according to claim 9,
Characters defined by the 2-byte character code are Japanese characters, simplified characters, traditional characters, or Korean characters.

The invention according to claim 11 is the invention according to claim 9 or 10,
When the character used in the language switched by the language switching means is defined by a 1-byte character code, the character to be displayed on the display screen defined by the 2-byte character code cannot be displayed. In some cases, the character is not displayed.

The invention according to claim 12 is the invention according to claim 9 or 10,
When the character used in the language switched by the language switching means is defined by a 1-byte character code, the character to be displayed on the display screen defined by the 2-byte character code cannot be displayed. In some cases, a predetermined symbol or sign is displayed.

  According to the first, fifth, and ninth aspects of the present invention, in the image forming apparatus including the operation display unit and the language switching unit that selectively switches the display language displayed on the display screen of the operation display unit, When the character used in the language switched by the switching means is defined with a 1-byte character code, characters in other languages that use the character defined with the 2-byte character code are displayed on the operation display section. It can be displayed in the same display screen. Therefore, the display language in the operation display unit of the image forming apparatus uses a character defined by a 1-byte character code different from a language that uses a character defined by a 2-byte character code in which characters are input. Even if the language is switched, it is possible to correctly display the input character string with the characters of the input language.

  According to the invention described in claims 2, 6, and 10, Japanese characters, simplified characters, traditional characters, or Korean characters are displayed in the same display screen as other languages using characters defined by a one-byte character code. It becomes possible to do.

  According to the invention described in claims 3, 7 and 11, when the character used in the language switched by the language switching means is defined by a 1-byte character code, it is defined by a 2-byte character code. When a character to be displayed on the display screen cannot be displayed, the character is not displayed, so that it is possible to prevent an erroneous character from being displayed on the display screen.

  According to the invention described in claims 4, 8, and 12, when the character used in the language switched by the language switching means is defined by a 1-byte character code, it is defined by a 2-byte character code. When characters to be displayed on the display screen cannot be displayed, a predetermined symbol or sign is displayed. Accordingly, it is possible to prevent an erroneous character from being displayed on the display screen, and to allow the user to recognize that there is a character to be displayed but cannot be displayed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the configuration will be described.

  FIG. 1 shows a functional configuration example of an image forming apparatus 1 according to the present invention. The image forming apparatus 1 is, for example, an electrophotographic copying machine, and as shown in FIG. 1, a control unit 11, an operation display unit 12, an image input unit 13, an image processing unit 14, an image forming unit 15, and communication control. The unit 16, the post-processing device 17, etc., are connected by a bus.

  The control unit 11 includes a CPU (Central Processing Unit) 11a, a storage unit 11b, a RAM (Random Access Memory) 11c, a VRAM (Video Random Access Memory) 11d, and the like.

  The CPU 11a of the control unit 11 reads out a system program and various processing programs stored in the storage unit 11b by operating the operation display unit 12, expands them in the RAM 11c, and in accordance with the expanded programs, each unit of the image forming apparatus 1 Centralized control of operation. Further, the CPU 11a executes various processes such as a display language switching process and an English character string display control process, which will be described later, according to the developed program.

  The storage unit 11b is configured by a non-volatile semiconductor memory or the like, and includes various processing programs such as a system program corresponding to the image forming apparatus 1, a display language switching processing program, an English character string display control processing program, various data, and the like. Is stored in advance.

As shown in FIG. 2, the storage unit 11b includes an English font data storage unit 111, a Japanese font data storage unit 112, a layout information storage unit 113, an English display character code storage unit 114, and a Japanese display character code. A storage unit 115 and an input character code storage unit 116 are provided.
The font data storage unit 111 for English is a character code that defines English characters (for example, ASCII (American Standard Code for Information Interchange), EBCDIC (Extended Binary Coded Decimal Interchange Code), etc., here ASCII). An English font data list R1 representing a correspondence relationship with font data representing characters (including numerals, symbols, and symbols) defined by each character code is stored. English characters are defined by a 1-byte character code. FIG. 3 shows an example of the English font data list R1. In FIG. 3, for example, a character code “52 (hex)” corresponds to font data representing the character “R”.
The Japanese font data storage unit 112 includes character codes that define Japanese characters (for example, JIS code, EUC (Extended UNIX (registered trademark) Code), Shift-JIS, etc., here referred to as Shift-JIS), A Japanese font data list R2 representing a correspondence relationship with font data representing characters (including numerals, symbols, and symbols) defined by each character code is stored. Japanese characters are defined by a 2-byte character code. FIG. 4 shows an example of the Japanese font data list R2. In FIG. 4, for example, the character code “8943 (hex)” corresponds to font data representing the character “rhyme”.

  The layout information storage unit 113 stores layout information for each display screen (various setting screens, device status display screens, etc.) displayed on the operation display unit 12. The layout information includes information indicating the display position of the character string on each display screen, information indicating the storage location of the character code of the character string displayed at each display position when English is selected as the display language, and display language Information indicating the storage location of the character code of the character string displayed at each display position when Japanese is selected is included.

The English display character code storage unit 114 stores a character code of a character string to be displayed on the layout of each display screen when English is selected as the display language.
The Japanese display character code storage unit 115 stores a character code of a character string to be displayed on the layout of each display screen when Japanese is selected as the display language.
The input character code storage unit 116 stores the character code of the character input via the character input screen 123 (see FIG. 9).

  The RAM 11c forms a work area for temporarily storing a system program executed by the CPU 11a, various processing programs, data being processed in each processing, processing results, and the like. The VRAM 11d is a memory that temporarily stores the contents displayed on the operation display unit 12.

  The operation display unit 12 is configured by an LCD (Liquid Crystal Display) or the like, and displays various operation items, device status display, operation status of each function, etc. on the display screen according to instructions of a display signal input from the control unit 11. I do. Moreover, on the LCD screen, a pressure-sensitive (resistive film pressure type) touch panel in which transparent electrodes are arranged in a grid is configured, and the XY coordinates of a force point pressed with a finger or a touch pen are detected by a voltage value. The detected position signal is output to the control unit 11 as an operation signal. Note that the touch panel is not limited to a pressure-sensitive type, and may be another electrostatic type, an optical type, or the like. Furthermore, the operation display unit 12 includes various operation buttons such as a numeric button and a start button, and outputs an operation signal generated by the button operation to the control unit 11.

  In the present embodiment, the operation display unit 12 is configured to be able to switch between Japanese display and English display based on an instruction from the control unit 11.

  The image input unit 13 includes a scanner below the contact glass on which the document is placed, and reads an image of the document. The scanner is composed of a light source, a CCD (Charge Coupled Device), etc., and forms an image of the reflected light of the light scanned from the light source to the original and photoelectrically converts it to read the image of the original. The image data is converted into digital image data by a converter and output to the image processing unit 14.

  The image processing unit 14 performs image processing such as spatial filter processing, enlargement / reduction processing, rotation processing, and gradation correction processing on the image data input from the image input unit 13 and outputs the processed image data to the image forming unit 15. Also, the printer code input from the communication control unit 16 is converted into a binary code, and the converted image data is output to the image forming unit 15.

  The image forming unit 15 includes a pulse width modulator, a laser light source, a photosensitive drum, a charger, a developing unit, a paper feeding unit, a paper discharge unit, a fixing device, and the like, and is input from the image processing unit 14. Image data is pulse-width modulated by a pulse width modulator to emit laser light, and the surface of the photosensitive drum charged by the charger is irradiated with laser light to form an electrostatic latent image. Further, the image forming unit 15 conveys the printing paper of the size and orientation input from the operation display unit 12 from the paper feeding unit, and attaches the toner to the area including the electrostatic latent image on the surface of the photosensitive drum by the developing device. After the toner is transferred and fixed on the conveyed printing paper, it is discharged from the paper discharge unit.

  The communication control unit 16 is an interface that can be connected to a transmission medium connected to a communication network such as a LAN (Local Area Network) or a WAN (Wide Area Network). The communication control unit 16 is constituted by a communication control card such as a LAN card, for example, and sends control signals and printer codes to and from an external device such as a printer controller connected to a communication network via a communication line such as a LAN cable. Send and receive various data including the beginning.

  The post-processing device 17 performs stapling operation, punching punching operation, sorting operation, and the like of the printing paper on which the image is formed based on a control signal from the control unit 11.

Next, the operation of the present embodiment will be described.
FIG. 5 shows a display language switching process executed by the control unit 11. This process is a process executed when a display language switching instruction is input from the operation display unit 12, and a software process by cooperation between the CPU 11a and the display language switching process program stored in the storage unit 11b. Is realized.

  First, the language switching screen 121 is displayed on the operation display unit 12 (step S1). FIG. 6 shows an example of the language switching screen. As shown in FIG. 6, on the language switching screen 121, a Japanese selection button B 1 for selecting Japanese as the display language on the operation display unit 12 and English for selecting English as the display language on the operation display unit 12. A selection button B2 is displayed. FIG. 6 shows the language switching screen 121 displayed when Japanese is selected as the display language. However, when English is set as the display language, the language switching screen is displayed in English. Is displayed.

  When Japanese is selected from the language switching screen 121 (step S2; YES), the display language is switched to Japanese (step S3). Thereafter, when each display screen is displayed on the operation display unit 12, The Japanese character string display control process is executed, and the character string is displayed on each display screen.

  On the other hand, if Japanese is not selected from the language switching screen 121 in step S1 (step S2; NO) and English is selected (step S4; YES), the display language is switched to English (step S5). Thereafter, when each display screen is displayed on the operation display unit 12, an English character string display control process is executed, and a character string is displayed on each display screen.

  FIG. 7 shows an English character string display control process executed by the control unit 11. This processing is executed when each display screen is displayed on the operation display unit 12 in a state where the display language is switched to English by the above-described display language switching processing, and is stored in the CPU 11a and the storage unit 11b. This is realized by software processing in cooperation with the English character string display control processing program.

  First, a character code for 1 byte is sequentially read from the character code of the character string to be displayed stored in the English display character code storage unit 114 or the input character code storage unit 116 (step S11). Next, it is determined whether or not the read character code is a Japanese character code (step S12). The first 1 byte of the Japanese character code is in the range of “81 to 9F (hex), E0 to EF (hex)”. Therefore, if the read character code for one byte is within this range, it is determined that the read character code is a Japanese character code.

  If it is determined in step S12 that the character code is a Japanese character (step S12; YES), a one-byte code following the read one-byte code is read (step S13) and read. The font data corresponding to the 2-byte code is read from the Japanese font data list R2 (step S14) and written into the VRAM 11d (step S16). Thereby, Japanese characters are displayed at a predetermined display position on the display screen of the operation display unit 12.

  On the other hand, if it is determined in step S12 that the character code is not Japanese (step S12; NO), the font data corresponding to the read 1-byte character code is read from the English font data list R1 ( Step S15) is written into the VRAM 11d (step S16). As a result, English characters are displayed at predetermined positions on the display screen of the operation display unit 12.

  When the above steps S11 to S16 are repeatedly executed and the fonts of all the characters to be displayed are written in the VRAM 11d (step S17; YES), this process ends.

  For example, when the character code of the character string to be displayed is “526561647920746F20636F7079 (hex)”, the character code “52 (hex)” for 1 byte is read first. Since “52 (hex)” is not in the range of “81-9F (hex), E0-EF (hex)”, the font data corresponding to the read 1-byte character code is for English shown in FIG. It is read from the font data list R1 and written to the VRAM 11d. As a result, the letter “R” is displayed at a predetermined position on the display screen of the operation display unit 12. The character string “Ready to copy” is displayed by repeatedly executing the above processing for all the character codes of the character string to be displayed.

  Note that the Japanese character string display control process executed in the state where the display language is switched to Japanese is the display target stored in the Japanese display character code storage unit 115 or the input character code storage unit 116. A one-byte code is read from the character code of the character string to be obtained, and the processes in steps S12 to S16 are executed.

  FIG. 8 is a diagram showing an example of the folder selection screen 122 displayed by executing the above-described English character string display control process. As shown in FIG. 8, even if the display language is switched to English, if Japanese characters “Yamada” and “Sato” are input as folder names, “Yamada” and “Yamada” are input as input. “Sato” can be displayed.

  As described above, in the English character string display control processing, when the display language is switched to English, it is stored in the English display character code storage unit 114 or the input character code storage unit 116. A 1-byte character code is read from the character code of the character string to be displayed, and it is determined whether it is a Japanese character code. If it is a Japanese character code, the subsequent 1-byte character The code is read, and the font data corresponding to the read 2-byte character code is read from the Japanese font data list R2, written into the VRAM 11d, and displayed at a predetermined display position on the display screen. . On the other hand, when the read character code is not a Japanese character code, font data corresponding to the read 1-byte code is read from the English font data list R1 and written to the VRAM 11d, and the display screen is displayed. It is displayed at a predetermined display position above. By repeating the above process, a character string to be displayed is displayed on the display screen.

  In other words, even when the English character string control process is executed and English in which the character is defined by a 1-byte character code is selected as the display language of the operation display unit 12, the character of the character string to be displayed is displayed. Judge whether or not Japanese characters defined by 2-byte character codes are mixed in the code, and if they are mixed, display the Japanese characters corresponding to the character code on the display screen to Control to display Japanese characters and Japanese characters on the same display screen.

  Therefore, it is possible to display a mixture of English characters and Japanese characters in the same display screen of the operation display unit 12, and even when English is selected as the display language, the character input screen 123 is used. Alternatively, it is possible to correctly display Japanese characters input via the communication control unit 16 on the display screen.

  The description in the above embodiment is a preferred example of the image forming apparatus 1 according to the present invention, and the present invention is not limited to this.

  For example, in the above embodiment, when a character defined by a 1-byte character code is an English character, a character defined by a 2-byte character code is a Japanese character, and English is selected as a display language, The case where Japanese characters are mixed in the same display screen has been explained as an example, but the characters defined by the 1-byte character code are not limited to English characters, and the characters defined by the 2-byte character code Is not limited to Japanese characters. According to the present invention, for example, simplified characters, traditional characters, and Korean characters defined by a 2-byte character code can be mixed in the same screen with European characters defined by a 1-byte character code. .

  Further, for example, when displaying characters input via the communication control unit 16, the image forming apparatus 1 may not be able to display the font data of the input characters because it is not implemented. For example, when the Japanese font data installed in the image forming apparatus 1 supports only the first level and second level characters, even if the third level characters are input from the external printer controller, Since there is no font corresponding to the character code, it cannot be displayed on the display screen of the operation display unit 12. Therefore, when a character code that does not have a font corresponding to Japanese font data is displayed as a display target by software processing in cooperation with the CPU 11a and the program, the display target portion is not displayed. It is preferable to convert a character code having no font to be converted into a predetermined character code and display a symbol or code corresponding to the character code at a display position of a character that cannot be displayed. Thereby, it is possible to prevent erroneous characters from being displayed on the display screen. Further, by displaying a specific symbol or code, it is possible to make the user recognize that there are characters to be displayed there but they cannot be displayed. Furthermore, the user may be able to easily recognize that the character to be displayed is not displayed by blinking the portion where the character that cannot be displayed is displayed or changing the color. .

  In addition, the detailed configuration and detailed operation of each apparatus constituting the image forming apparatus 1 can be changed as appropriate without departing from the spirit of the present invention.

1 is a block diagram showing a functional configuration of an image forming apparatus 1 according to the present invention. It is a figure which shows the structural example of the memory | storage part 11b of FIG. It is a figure which shows an example of the font data list R1 for English memorize | stored in the font data storage part 111 for English of FIG. It is a figure which shows an example of the Japanese font data list R2 memorize | stored in the Japanese font data storage part 112 of FIG. It is a flowchart which shows the display language switching process performed by the control part 11 of FIG. It is a figure which shows an example of the language switching screen 121 displayed on the operation display part 12 of FIG. It is a flowchart which shows the character string display control process for English performed by the control part 11 of FIG. 6 is a diagram showing an example of a folder selection screen 122 displayed on the operation display unit 12 of the image forming apparatus 1 to which the present invention is applied. FIG. It is a figure which shows an example of the character input screen 123 displayed on the operation display part 12 of FIG. FIG. 10 is a diagram illustrating an example of a folder selection screen 124 displayed on an operation display unit when Japanese is selected as a display language in a conventional image forming apparatus. FIG. 10 is a diagram illustrating an example of a folder selection screen 125 displayed on an operation display unit when English is selected as a display language in a conventional image forming apparatus.

Explanation of symbols

1 Image forming apparatus 11 Control unit 11a CPU
11b Storage unit 11c RAM
11d VRAM
111 English font data storage unit 112 Japanese font data storage unit 113 Layout information storage unit 114 English display character code storage unit 115 Japanese display character code storage unit 116 Input character code storage unit 12 Operation display unit 13 Image input Section 14 Image processing section 15 Image forming section 16 Communication control section 17 Post-processing device R1 Font data list for English R2 Font data list for Japanese

Claims (12)

In an image forming apparatus comprising: an operation display unit; and a language switching unit that selectively switches a display language displayed on the display screen of the operation display unit.
When a character used in the language switched by the language switching means is defined by a 1-byte character code, the operation is performed on a character in another language that uses a character defined by a 2-byte character code. An image forming apparatus comprising control means for displaying on the same display screen of a display unit.   The image forming apparatus according to claim 1, wherein the character defined by the 2-byte character code is a Japanese character, a simplified character, a traditional character, or a Korean character.   The control means, when a character used in the language switched by the language switching means is defined by a 1-byte character code, a character to be displayed on the display screen defined by a 2-byte character code The image forming apparatus according to claim 1, wherein when the character cannot be displayed, the character is not displayed.   The control means, when a character used in the language switched by the language switching means is defined by a 1-byte character code, a character to be displayed on the display screen defined by a 2-byte character code The character code corresponding to the character is converted into a predetermined character code, and the symbol or code corresponding to the converted character code is displayed. The image forming apparatus according to 2. A method for controlling the operation display unit in an image forming apparatus, comprising: an operation display unit; and a language switching unit that selectively switches a display language to be displayed on a display screen of the operation display unit,
When a character used in the language switched by the language switching means is defined by a 1-byte character code, the operation is performed on a character in another language that uses a character defined by a 2-byte character code. A control method of displaying on the same display screen of a display unit.   The control method according to claim 5, wherein the character defined by the 2-byte character code is a Japanese character, a simplified character, a traditional character, or a Korean character.   When the character used in the language switched by the language switching means is defined by a 1-byte character code, the character to be displayed on the display screen defined by the 2-byte character code cannot be displayed. 7. The control method according to claim 5, wherein the character is not displayed in some cases.   When the character used in the language switched by the language switching means is defined by a 1-byte character code, the character to be displayed on the display screen defined by the 2-byte character code cannot be displayed. 7. The control according to claim 5 or 6, wherein a character code corresponding to the character is converted into a predetermined character code and a symbol or a code corresponding to the converted character code is displayed. Method. A display method of a display screen of the operation display unit in an image forming apparatus comprising: an operation display unit; and a language switching unit that selectively switches a display language displayed on the display screen of the operation display unit,
When a character used in the language switched by the language switching means is defined by a 1-byte character code, the operation is performed on a character in another language that uses a character defined by a 2-byte character code. A display method comprising displaying on the same display screen of a display unit.   The display method according to claim 9, wherein the character defined by the 2-byte character code is a Japanese character, a simplified character, a traditional character, or a Korean character.   When the character used in the language switched by the language switching means is defined by a 1-byte character code, the character to be displayed on the display screen defined by the 2-byte character code cannot be displayed. 11. The display method according to claim 9, wherein in some cases, the character is not displayed.   When the character used in the language switched by the language switching means is defined by a 1-byte character code, the character to be displayed on the display screen defined by the 2-byte character code cannot be displayed. 11. The display method according to claim 9, wherein a predetermined symbol or sign is displayed in some cases.

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