JPH04106592A - Japanese character display device - Google Patents

Abstract

PURPOSE:To easily display plural ANK fonts at the same time and to display half-sized characters even in shift-JIS code mode by providing the font selection bit of attribute data and a flag corresponding to it. CONSTITUTION:A display controller 1 generates a display memory address and a display character code and attribute data corresponding to it are read out of a code memory 2. A control circuit 5 selects one of flags F1 and F0 according to the font select bit of the data A read out of the memory 2 and a font memory (one of ANK0 and ANK1 in an ANK font memory 3 and a KANJI(Japanese character) font in a KANJI font memory 4) is selected according to the bit and the selected flag. Then the selected ANK font of KANJI font is converted by a paralle-series converting circuit 6 to generate video data, which is displayed as a desired pattern on a display monitor 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a Japanese character display device that can display a mixture of kanji and alphanumeric characters.

(Prior Art) Generally, a display device is a personal computer,
It is positioned as the core of man-machine for office automation equipment such as word processors. Recently, CRT
In addition to display devices, flat type devices such as plasma display devices and liquid crystal display devices have also been put into practical use, and efforts are being made to make them more compact.

By the way, to display Japanese, kanji are encoded,
As for this code system, it is common to use a 2-byte JIS code or a shift JIS code. The characters expressed as this kanji hood are alphanumeric characters (hereinafter referred to as AN
It has the width of two characters (referred to as the K character) and is called a full-width character. On the other hand, ANK characters are called half-width characters.

(Problem to be Solved by the Invention) Considering the balance of displayed characters, it is desirable that hiragana etc. be displayed in half-width characters. However, since JIS kanji are full-width characters, they must be prepared as external characters. When a 2-byte JIS code is used, half-width characters are realized by having a code for each half-width character and treating unused areas as half-width characters. However, shift JIS
When codes are used, methods such as 2-byte JIS cannot be used, and it is therefore impossible to display half-width non-standard characters.

The present invention has been made in view of the above circumstances, and it provides a Japanese language that can easily display multiple ANK fonts simultaneously by adding a small amount of hardware, and can also display half-width non-standard characters even in Shift JIS code. The purpose is to provide a character display device.

[Structure of the Invention] (Means for Solving the Problems) The Japanese character display device of the present invention includes a character code memory in which display character codes are stored, and a code for each display character code stored in the character code memory. an attribute memory that stores attribute data including font selection bits for font selection; an alphanumeric font memory that stores a plurality of types of alphanumeric character fonts; and a kanji font memory that stores kanji fonts. From the character code memory by referring to the flag set corresponding to the font that can be specified by the font selection bit above and the flag corresponding to the font specified by the font selection bit of the attribute data read from the attribute memory. Determine whether the read display character code is an alphanumeric code or a kanji code, and if it is an alphanumeric code, display multiple alphanumeric characters mixed with kanji using the font selection bit of the above attribute data. It consists of a control circuit.

(Function) The present invention is realized by having a flag corresponding to an ANK font that can be specified by a font selection bit allocated in attribute data. A control circuit determines whether the displayed character code read from the character code memory is an ANK code or a kanji code, and if it is an ANK code, multiple fonts can be selected, and a character generator (alphanumeric character By configuring the font memory (font memory) with RAM and being able to store any ANK pattern, it is possible to display half-width non-standard characters even in Shift JIS.

According to the present invention, a plurality of ANK fonts can be displayed simultaneously by having a font selection bit of attribute data and a flag corresponding to the font selection bit. Also this AN
By making the K font programmable, there are effects such as the ability to display half-width non-standard characters even in the Shift JIS code.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, reference numeral 1 indicates a display controller (CRT).
C) and generates a display memory address. Reference numeral 2 is a code memory having a RAM configuration, which stores display character codes and display attributes corresponding to each display character code.
That is, attribute data is stored. One specific bit in this attribute data is allocated as a font selection bit for font selection.

Reference numeral 3 denotes an ANK font memory (ANK character pattern generator) having a RAM configuration, in which a plurality of types of programmable ANK fonts are stored. For example, an ANK font that follows the 2-byte JIS code and a half-width external character font that follows the Shift JIS code are AKO and ANKI, respectively.
It is stored in the NK font memory 3. Reference numeral 4 denotes a ROM-configured Kanji font memory (Kanji pattern generator) in which Kanji fonts are stored. Reference numeral 5 denotes a control circuit, which selects the font memory 3.4 according to the font selection bit in the attribute data described above and a flag FIFO, which will be described later.

Reference numeral 6 denotes a parallel-to-serial conversion circuit (PSC), which converts parallel data into serial dots to generate a video signal. Reference numeral 7 denotes a display monitor, which converts video data into a video signal by scanning the video data and displays the signal.

The operation of the embodiment of the present invention will be described below.

First, a display memory address is created by the display controller (CRTC) 1, and the corresponding display character code and attribute data are read from the code memory 2. Here, the control circuit 5 uses the font selection bit in the attribute data read from the code memory 2 (the embodiment of the present invention shows the case of two fonts) to select a font corresponding to the font specified by the same bit. Select one of the flags (in this case, flags Fl and FO), and select the font memory (AN'KO or ANKI in ANK font memory 3, Kanji font in Kanji font memory 4) depending on the state of the same bit and the selected flag. ). Its operation is shown in Tables 1 and 2 below.

(1) Font selection bit - “0” clause 1
Table (2) Font selection bit - Case of “1” As is clear from Table 1 above, when the flag FO is selected by the font selection bit in the attribute data, the FO
- If it is "1", the displayed character code is judged as an ANK code, and the alphanumeric pattern ANKO stored in the ANK font memory 3 is selected (if the code is 8 bits, 25
6 types). If FO-"0", the displayed character code is determined to be a Kanji code, and in the case of Shift JIS, ANKO of the ANK font memory 3 is selected for the ANK area, and Kanji font memory 4 is selected for the Kanji area. As is clear from Table 2, the same operation occurs when flag F1 is selected. However, when ANK font memory 3 is selected,
ANKI fonts (256 types if the code is 8 bits)
is selected. Thereafter, the parallel-to-serial conversion is performed in a parallel-to-serial converter (PSC) 6 to create video data.
The desired pattern is displayed on the display monitor 7.

Effects of the Invention] As described above, according to the present invention, a plurality of ANK fonts can be displayed simultaneously by having a font selection bit assigned to attribute data and a flag corresponding to the font selection bit. Furthermore, by making this ANK font programmable, there are effects such as the ability to display half-width non-standard characters even in the Shift JIS code.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention. 1... Display controller (CRTC), 2...
...Code memory, 3...ANK font memory, 4
... Kanji photo memory) 5. Control circuit, 6. Parallel-serial conversion circuit (PSC) 7. Display monitor.

Claims (1)

[Claims] A character code memory in which display character codes are stored; an attribute memory in which attribute data including font selection bits for font selection are stored for each display character code stored in the character code memory; The alphanumeric font memory stores alphanumeric character fonts, the kanji font memory stores kanji fonts, the flags set corresponding to the fonts that can be specified by the above font selection bits, and the read from the above attribute memory. The display character code read from the character code memory is determined whether it is an alphanumeric code or a kanji code by referring to the flag corresponding to the font specified by the font selection bit of the attribute data to be displayed. A Japanese character display device comprising: a control circuit that displays a plurality of alphanumeric characters mixed with Kanji characters according to the font selection bit of the attribute data when the characters are codes.