JPH0125074B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a character display control method for controlling the arrangement of displayed characters in a display device.

(b) Prior art and problems In display devices such as Japanese language processing systems, when displaying characters by sending character codes from the processing device to the display device, punctuation marks (“.”,
",") is the next line (the line following the line where the character is displayed)
This may be the character array displayed at the beginning of the .

To prevent this, a conventional method has been adopted in which a free display area for one character is provided at the right end of the display screen (when displayed horizontally) and this area is used as an area exclusively for displaying punctuation marks. Alternatively, certain characters such as ``ru'', ``ta'', ``te'', ``ke'', etc. can be specified as characters with punctuation marks (``ru.'', ``te''...). By registering the code and supplying this specific code to the display device as necessary, the end of the display line is processed.

As described above, the conventional system has the disadvantage that the original display area is narrowed due to the display processing of punctuation marks, or that character codes for specific characters must be registered.

(c) Purpose of the Invention The present invention has been made to solve the above-mentioned drawbacks, and its purpose is to provide a character display control method that facilitates control of the arrangement of displayed characters.

(d) Structure of the Invention The present invention provides a system that includes a processing device and a display device that displays a display dot pattern generated in response to a character code received from the processing device. When it is detected that a character positioned in and means for generating a memory pattern in which the display dot pattern of the code is shifted as specified by the control code when the display device receives the control code. This character display control system is characterized by having means for superimposing and displaying the memory pattern generated from the character code attached with the control code, which is successively received.

(e) Examples of the invention The present invention will be explained below with reference to the drawings. FIG. 1 is a display example for explaining the present invention, FIGS. 2 and 3 are memory pattern diagrams for explaining an embodiment of the present invention, and FIG. 4 is a block diagram for explaining an embodiment of the present invention. , 1 is a processing unit, 2 is a switching unit, 3 is a character generator, 4 is a control unit, 5, 6, 9, 10, 11 are address counters, 7, 8 are registers, 12 is a display control unit, 13 is a display Control part, C ₁ and C ₂ are character codes,
L ₂ , R ₇ are control codes, l ₂ , R ₇ are shift pulses,
_M1 , _M2 , _M3 , _M4 , m1, _{m2 , m3} , _m4 are memories, _M5 , _m5 are display memories, P is a pulse signal, S
is a switching signal, and A and B are contacts. Figure 1 shows the display screen, and when a sentence ends at the final position of the first line as shown in Figure 1a, in the usual way, a full stop mark ``.'' is used.
will be displayed at the beginning of the second line. In such a case, as shown in Figure 1b, the ``sentence''
It is desirable to display a period "." at the end of the last character. The present invention enables this display control in a raster scan type display device.

As is well known, in a raster scan type display device, a display dot pattern signal output from a character generator is stored in a display memory, and then used as a brightness signal for the display section.

FIG. 2 is an explanatory diagram of a state in which display dot pattern signals are stored in memories, and the memories m ₁ and m ₂
A signal "1" indicating the black level is written in the diagonally shaded area, and a signal "0" indicating the white level is written in the other white areas. Memory in Figure 2
A dot pattern signal for displaying the hiragana character "ta" is written in _m1 , and a dot pattern signal for displaying the period mark "." is written in memory _m2 .

The number of dots for displaying one character (including spaces) is 144 (12 x 12), so the memory capacity is m ₁ and m _2.
The memory capacity of is 144 (12 x 12) bits. In order to display both the character "ta" and the period "." within the number of 144 display dots for one character, it is sufficient to combine the two display dot pattern signals into one. Figure 3 shows how to achieve this.

In FIG. 3, the memory pattern of memory _m3 is
The state in which the data in memory _m1 shown in Fig. 2 has been transferred is shown. During the transfer, the data read from memory _m1 is shifted 2 bits to the left and then written to memory _m3 . It's complicated. Similarly, the memory pattern of memory _m4 shows the state in which the data in memory _m2 in FIG. 2 has been transferred,
During transfer, the data read from memory _m2 is shifted to the right by 7 bits, and then transferred to memory.
This is what I wrote in _m4 . This memory m ₃ and m ₄
Displays the superimposed data obtained by logically adding both of the memory _m5
, the dot patterns (signals) of both the character "ta" and the phrase "." are written in the memory for one character (144 bits) as shown in the figure. Therefore, if the dot pattern (signal) is read out from the display memory _m5 and sent to the display section, as shown in FIG. ” can be displayed.

M ₁ , M ₂ , M ₃ , M ₄ and display memory M ₅ in FIG. 4 have a capacity of 144 (12×12) bits.
Writing/reading to/from this memory (M ₁ to ^{M 5} ) is performed by addressing determined by the values of address counters (5, 6, 9, 10, and 11). Note that these address counters are driven by a pulse signal P having a predetermined period. In Figure 4,
If it is necessary to shift the position of a displayed character, the processing device 1 sends out a control code (L ₂ , R ₇ ) following the character code (C ₁ , C ₂ ).

In the embodiment, the control code L ₂ is sent after the character code C ₁ (the character "ta"), and the control code R ₇ is sent after the character code C ₂ (the period "."). The control code _L2 is a command to shift the data in the memory by 2 bits to the left, and the control code _R7 is a command to shift the data by 7 bits to the right. The control unit 4 identifies the received data, inputs the character codes C ₁ and C ₂ to the character generator 3, and issues a switching signal S. Further, a shift pulse l ₂ (two pulse signals) is output in response to the control code L ₂ and a shift pulse r ₇ (seven pulse signals) is output in response to the control code R ₇ . The dot pattern signal for displaying the character "ta" from the character generator 3 is written into the memory _M1 through the contact A of the switching unit 2, while the dot pattern signal for displaying the period point "." is written into the memory _M2 through the contact B. (The switching unit 2 is switched character by character by the switching signal S.) Registers 7 and 8 are 12-bit registers, and memory _M1 and
The data in _M2 is read out in units of 12 bits and set in registers (7 and 8). The memory patterns of memories M ₁ and M ₂ in FIG. 4 are the same as the memory patterns of memories m ₁ and m ₂ shown in FIG. The 12-bit unit data read from the memory _M1 as the address counter 5 is driven is shifted 2 bits to the left by the shift pulse _l2 in the register 7, and then this data is written to the memory _M3. It will be done. This read/shift/
When the series of write operations is repeated 12 times, the memory
Data transfer from M ₁ to memory M ₂ is completed. The memory pattern of memory _M3 is the same as the memory pattern of memory _m3 shown in FIG. Similarly, if you read the data in memory _M2 to register 8 in units of 12 bits, shift the data in register 8 to the right by 7 bits, and then write and transfer it to memory _M4 , the memory pattern in memory _M4 will be changed. is the same as the memory pattern of memory _m4 shown in FIG.

Therefore, the data in the memories _M3 and _M4 in FIG. 4 are read out, and the logical sum thereof is displayed in the memory _M5.
By writing to the display memory _M5 , the third
The same memory pattern as the memory _m5 shown in the figure is obtained. By reading out the dot pattern signal in the display memory _M5 and sending it to the display control section 12, the display section 13 displays the character "ta" at the end of the line followed by the period "." as shown in FIG. 1b. ” can be displayed.

(f) Effects of the Invention As described above, the present invention makes it possible to display punctuation marks together with characters at the end of a line, and has the advantage of facilitating character display control.

[Brief explanation of drawings]

FIG. 1 is a display section for explaining the present invention, FIGS. 2 and 3 are memory pattern diagrams for explaining an embodiment of the present invention, and FIG. 4 is a block diagram for explaining an embodiment of the present invention. The symbols used in the figure are as follows. 1 is a processing device, 2 is a switching unit, 3 is a character generator,
4 is a control unit; 5, 6, 9, 10, and 11 are address counters; 7 and 8 are registers; 12 is a display control unit; 13 is a display control unit; C ₁ and C ₂ are character codes;
L ₂ , R ₇ are control codes, l ₂ , R ₇ are shift pulses,
_M1 , _M2 , _M3 , _M4 , m1, _{m2 , m3} , _m4 are memories, _M5 , _m5 are display memories, P is a pulse signal, S
indicates a switching signal, and A and B indicate contacts.

Claims (1)

[Scope of Claims] 1. In a system comprising a processing device and a display device that displays a display dot pattern generated in response to a character code received from the processing device, the processing device includes: When it is detected that a character is a predetermined character, the character code of the character and the character immediately before the character is sent to the display device with a control code specifying the required shift direction and amount, respectively. means for generating a memory pattern in which the display dot pattern of the character code is shifted as specified by the control code when the display device receives the control code; 1. A character display control system comprising means for superimposing and displaying the memory pattern generated from the character code attached with the control code received by the character code. 2. The present invention is characterized by comprising means for combining a plurality of display dot pattern signals having the changed dot configuration into one dot pattern when the display device receives at least two or more character codes and control codes. A character display control method according to claim 1.