JPH0990928A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display optional-sized character and rule in a character display format related to a display device. SOLUTION: This device is the display device provided with a video RAM 3 making the number of dots that the line data of the font data are written simultaneously the least figure width, specifying the column direction by an offset address and specifying the line direction by a segment address, and displaying characters of plural kinds of sizes containing the rule, and is provided with a font data generation part 1 generating the font data of the specified size and read out line-simultaneously and a font data write-in part 2 writing by scanning in the column direction and the line direction based on the number of figures and a segment length constituting the font data from the offset address position and the segment address position of the video RAM 3 specified as the write start position of the font data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for displaying characters and ruled lines of arbitrary size in a character display format (fixed digit, line display format).

In recent years, portable terminal devices (handy terminals) are often used in the distribution industry of department stores and retail stores. The size of the display screen in this mobile terminal device is relatively small, and the size and the number of display characters are limited. For this reason, a character (one type) having a simple expression and a size that is easy to see is adopted, but on the other hand, it is also desired that a large amount of information can be displayed in terms of operation.

For this reason, there is a demand for a simple display device capable of selectively using both of these requests on a screen having a limited size according to the application.

[0004]

2. Description of the Related Art FIG. 9 is a view showing an operation surface of a portable terminal device
FIG. 10 is a diagram showing a conventional display example. FIG. 9 shows the operation side of the mobile terminal device 20, and when it is used for inventory management in, for example, the distribution industry, as shown in FIG. , And enter the number using the ten-key pad 11, and then enter the number of orders based on the result.

When there are many products to be handled, the next page of the list is displayed by touching the "next page" which is a touch key. After all input is complete, connect to the host to send those data, or the printer section
Perform operations such as printing out with 15.

[0006]

Since the portable terminal device 20 is small and light for portable use, the size of the display screen is limited. When a table having a large number of items is displayed on this limited screen, it does not fit on one screen, so the table is divided and the previous page / next page shown in FIG. 8 is operated to turn the page. It becomes a configuration and the operation becomes troublesome. For this reason, if small characters are displayed, many items can be displayed on one screen, and operability can be improved.

However, in the past, the size of characters was fixed and the size was universal so that it could be commonly used in various applications, so that the amount of information that can be displayed on one screen is increased. It was difficult.

In view of the above problems, it is an object of the present invention to provide a display device capable of dealing with many purposes by displaying a character of arbitrary size and a ruled line corresponding to the character.

[0009]

To achieve the above object, the display device of the present invention minimizes the number of dots in which line data constituting font data are simultaneously written, as shown in the principle diagram of the present invention in FIG. A display device for displaying characters of a plurality of sizes including ruled lines in a character display format via a video RAM 3 in which a digit direction is designated by an offset address and a line direction is designated by a segment address as a digit width. A video RAM 3 in which line data of the minimum digit unit of the font data is simultaneously written based on the segment address and the offset address, and a font data generation unit 1 which generates font data of a specified size and is read out simultaneously in lines. , Extracting font data of a specified size from the font data generating unit 1, From the offset address and the segment address position of the video RAM 3 designated as the data writing start position, scanning is performed in the digit direction and the line direction based on the number of digits and the segment length forming the font data, and the line is written in the video RAM 3. A font data writing section 2 for writing at the same time is provided.

As described above, in the character display mode in which characters are displayed in units of lines and digits, the number of bits (dots) simultaneously written in the VRAM 3 is set to the minimum digit width, and the minimum segment width corresponding to the digit width is used as a reference. Digit of expanded character of
Since the number of lines is set and scanning writing is performed, it is possible to easily display characters of various sizes in a mixed manner without reducing the writing speed.

[0011]

2 is a block diagram showing an embodiment of the present invention, FIG. 3 is a diagram showing an example of the size of a display character, FIG. 4 is a processing flowchart, FIG. FIG. 8 is an explanatory drawing of alphabetical standard characters, FIG. 7 is an explanatory drawing of reduced character drawing, and FIG. 8 is a diagram showing an embodiment of display. Note that the same reference numeral represents the same object throughout the drawings.

In this embodiment, an example applied to the portable terminal device shown in FIG. 9 is shown. FIG. 2 shows an example of the configuration. Here, 13 is a video RAM, which is composed of a random access memory (RAM) capable of simultaneously writing and reading in units of 1 byte (minimum digit width). In the following description and in FIGS. 5 to 7, it is assumed that the address of the video RAM 13 is represented by 5 digits in hexadecimal notation, the upper 4 digits of which are the segment address and the lowest 1 digit of which is the offset address. Shall be represented. For example, FIG. 5 shows a case where the number of dots on the screen is 640 (horizontal) × 480 (vertical). The number of digits is 8 because 1 byte has a minimum of 1 digit
It becomes 0 digit and is represented as 0050 [H]. Therefore, the segment address of the next line is a segment address display value added with 0005 [H], for example, A000.
[H] → A005 [H], and the next line can also be designated by this segment address and offset address.

Reference numeral 16 denotes a screen definition body, which stores display data such as items and ruled lines shown in FIG. For each item, character,
Attributes such as ruled line size and display position are also defined. 19
Is a font data generation unit, in which font data to be displayed is registered according to size, and when the character size is designated, the switching unit 18 switches to the corresponding font data generation unit 19,
Depending on the character code, the corresponding font data is read out line by line (one line at a time).

Reference numeral 14 is a font data writing unit, which is a screen definition
16, the switching unit 18 is controlled to switch to the font data generating unit 19 of the designated character size to simultaneously read the font data to be displayed, and the font data is written to the VRAM 13 by the procedure described later. Although not shown, the size of the character input in the input field is also defined in the screen definition body, and the number or the like input from the numeric keypad is dot-expanded in the VRAM 3 in the specified size.

Reference numeral 12 is a display device, which corresponds to the VRAM 13 and is 64.
Comprised of 0x480 dot display matrix, VR
The contents of AM13 are repeatedly read and the font data is displayed. The actual size of the character is determined by the number of dots forming the font data and the dot display interval.

Reference numeral 17 is an application program, CP
It runs in U, controls the font data writing unit, displays a list, etc., and displays the input data in an input field surrounded by the ruled lines of the list, and performs an interactive process.

Reference numeral 10 denotes a central processing unit, which controls each unit to execute an application. FIG. 3 shows an example of the size of characters displayed on the mobile terminal device. The minimum character configuration is 8 dots (1 byte in memory bit conversion) x 8 lines, standard characters 8 dots x 16 lines (alphabet) 16 x 16 (Kanji) reduced characters 8 x 8 (Alphabet) 16 x 8 (Kanji) landscape Double-width characters 16x16 (alphabet) 32x16 (kanji) Vertical double-width character 8x32 (alphabet) 16x32 (kanji) Quadruple-width character 16x32 (alphabet) 32x32 (kanji). In this way, the minimum character (reduced character) vertical,
By multiplying the number of horizontal dots by an integer, the font data of standard characters, reduced characters, double-width characters, double-width characters, and double-width characters can be written in the VRAM 3 in units of lines and columns of that size.

In the terminal device configured as described above, characters of different sizes are displayed by dot development on the VRAM 3 as described below. (Refer to FIG. 4) Here, it is assumed that the character size is changed line by line,
It is assumed that the character size and the position of the first character are specified at the beginning of the display character string of one line. (1) Display the character code of the item and the ruled line in the screen definition
Read more. (2) First, the size of the designated character on the line is determined. (3) For standard Kanji characters (2 bytes x 16 lines), the process shown in Fig. 5 is performed. Now the first letter V
Assuming that the storage position (drawing position) in the RAM3 is 0 digit and 0 line, the segment address = A000 [H] (V in the main memory) as the drawing position of the VRAM3.
RAM start address) 1st byte of Kanji offset address = 0000
[H] Kanji second byte offset address = 0001
[H] is calculated.

The switching unit 18 is switched to take out the 2 bytes of the first line of the font data of the standard Kanji character from the font data generating unit 19, and the font data of the 1st byte is set to offset = 0000 [H] and the 2nd byte. The eye font data is written at offset = 0001 [H].

Since the writing of the first line of the font data is completed, the offset of the segment address A005 [H] obtained by adding the offset value 0005 [H] to the segment address = A000 [H] = 0000 [H], 00
At 01 [H], the font data of the first byte and the second byte of the second line is written.

By repeating the above process for 16 lines, the standard characters of Chinese characters are written in the VRAM 13. As a result, one character is drawn by the number of read / write accesses of 2 × 16 times.

When writing standard characters of the alphabet (reduced characters of Kanji), the processing shown in FIG. 6 is performed. In this case, since each line of the font data has a 1-byte width, the read / write access of the font data in each line is performed once (0 to 7 bits are set as 1 line simultaneously and
Times). That is, one character is drawn by reading / writing 16 times in the vertical direction.

When the second character on the same line is adjacent to the first character, it is written from the segment address A000 [H] and the offset address 0001 [H].
In this way, the third and fourth characters are written to the offset addresses 0002 [H] and 0003 [H]. The characters on the second line are the segment address A05.
It is written from 0 [H]. (4) The reduced letters of the lower case alphabet are written as shown in FIG. In this case, one line data (1 byte = 8 bits) is written once, as in FIG. 6, and this is repeated 8 times. As a result, the reduced character can be expanded by reading / writing 1 × 8 times.

In this case, the writing start position of each character is
The horizontal direction is 0000 [H], 00001 [H] ..., and the vertical direction is A000 [H], A028 [H] ...
Becomes

Explaining in the case of Kanji, horizontal double-width characters are doubled in FIG. 5 for horizontal 4 digits, vertical double-width is 32 lines, and double in the vertical direction of FIG. Is doubled. Further, in the case of those double-width characters, the starting positions of digits and lines are determined in units of minimum digits and in units of 8 lines according to their respective sizes. (5) As described above, characters of each size can be written in units of line digits (character display format), and the entire VRAM is repeatedly scanned and read and displayed. FIG. 8 shows a display example. Headings can be drawn with standard characters, each item and ruled lines can be drawn with reduced characters, and the number of items is significantly increased compared to FIG.

Although FIG. 8 shows an example in which the ruled line is assigned as one character, if the length of the ruled line is 3 lines (space lines for one line are provided above and below), the amount of information is further increased. Can be increased.

As described above, in the display device of the character display style, the characters of different sizes are scaled up and down in line column units, so that characters of arbitrary size can be drawn at high speed according to the application. It becomes possible.

[0028]

As described above, according to the present invention, in a display device of a character display style, characters of different sizes are displayed in units of line digits, and are displayed in an enlarged or reduced size based on the minimum digit width and the line width. Therefore, it is possible to select a character having an arbitrary size according to the application, and it is possible to display an optimum character in a limited screen.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a configuration diagram of an embodiment.

FIG. 3 is a diagram showing an example of the size of display characters.

[Fig. 4] Process flow chart

[Figure 5] Illustration of standard kanji drawing

[Fig. 6] Drawing explanatory diagram of standard alphabet characters

FIG. 7 is an explanatory diagram of reduced character drawing.

FIG. 8 is a diagram illustrating an exemplary embodiment of a display.

FIG. 9 is a diagram showing an operation surface of a mobile terminal device.

FIG. 10 is a diagram showing a conventional display example.

[Explanation of symbols]

1 Font data generating section 2 Font data writing section 3 Video RAM (VRAM) 10 Central processing unit CPU 11 Numeric keypad 12 Display 13 VRAM 14 Font data writing section 15 Printer section 16 Screen definition body 17 Application program 18 Switching section 19 Font Data generator 20 Mobile terminal

Claims (1)

[Claims] 1. A ruled line is formed via a video RAM in which a digit direction is designated by an offset address and a line direction is designated by a segment address, with the number of dots at which line data constituting font data is simultaneously written as a minimum digit width. A display device for displaying characters of a plurality of different sizes in a character display format, including a video RAM to which line data in minimum digit units of the font data are simultaneously written based on the segment address and offset address, A font data generation unit that generates font data of different sizes and is read out simultaneously on a line; and a font data of a specified size is extracted from the font data generation unit and designated as a writing start position of the font data. Offset address and segment add of the video RAM A display device, comprising: a font data writing unit that scans in the digit direction and the line direction based on the number of digits and the segment length that form the font data and writes the lines to the video RAM simultaneously from the reply position.