JPH026995A - Display device - Google Patents

Abstract

PURPOSE:To improve the operability by providing a 1st storage means stored with plural character data and a 2nd storage means stored with all characters data stored in said storage means in a readable/writable state and displaying each character in the character font. CONSTITUTION:Character data required for display are read out by the same operation as operation for reading character data required for display out of the 1st storage means 12a. When corrected character data are stored in the 2nd storage means 12b, the data are stored in their original addresses of the 2nd storage means 12b. Therefore, all the character data are stored in the 2nd storage means 12b where addresses corresponding to addresses of the 1st storage means 12a are assigned without reference to whether the data are corrected or not and displayed at a display part 13. Consequently, the operability is improved.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is used for displaying characters such as letters.
In a display device that uses font data such as letters, characters such as letters are stored in memory as font data for each character, and the desired character is displayed by selectively reading out the character data from memory. It is well known that this is done. This accounts for 1% of the display devices that display characters, and conventionally, data ROM (ReadOnlyM
Since characters such as letters were displayed by reading out the type character data stored in the e+aory (usually called a character generator) as is, only standard glyph shapes could be displayed.

In order to improve the second drawback, in recent years, standard character data stored in a data ROM is read out, and then the data is modified to change the original standard characters to bold, slanted, or Display devices have also been developed that are able to display unique character characters by changing the characters to characters with citations.

FIG. 7 is a block diagram showing a general configuration of a conventional display device having a character correction function.

In FIG. 7, a data ROM 1 is a memory in which a plurality of character data are stored, and a data RAM 1 (Random^ccess 5enso
ry ) 2 temporarily stores the character data read out from the data ROM 1 for modification, etc.
It is also a memory for storing modified character data. Memory for data RAM 2+f! The area includes a data leaning area for storing character data after correction of the character data read from the data ROM 1;
It also includes a work area i1 for reading and temporarily storing character data in the data ROM 1 and performing correction work. A character font corresponding to the character data stored in the data area or workpiece leaning wall is displayed on the display section 3.

CPU (Central Processing)
Unit) 4 has the function of selectively reading out the character data stored in the data ROM 1 into the work area of the data RAM 2, and the function of modifying the character data read into the work area into a desired shape. , a central processing unit having functions such as writing corrected character data into the data area of the data RAM 2. CPU
Each of the above-mentioned functions in No. 4 can be performed using the keyboard 5, which is an input means.
It works based on instructions given from the computer and programs stored in the program ROM 6.

The display device described above operates according to the following steps.

When a command to modify a predetermined character is input from the keyboard 5, the CPU 4 reads the specified character data from the data ROM 1 and stores it in the data RA.
The character data is stored in the work area of M2, and the character data is also output to the display part 3 at the same time.The display part 3 receives the character data and displays the corresponding character in the display part 3. In response to an instruction to modify the character given from the keyboard 5 while looking at the character, the CPU 4 modifies the character data stored in the work area of the data RAM 2.

Along with this modification process, the character displayed on the display section 3 is also modified. When the modification process is completed, based on a command input from the keyboard 5, the CPU 4 adds a file name to the modified character data and stores it in the data area of the data RAM 2. Thereafter, when this modified character is to be displayed, the above-mentioned file name is input and the desired modified character data is called from the data area of the RAM 2 to the work area.

Problems to be Solved by the Invention In the conventional display device described above, a file name is assigned to each character data that has been corrected in the workpiece of the data RAM 2, and the file name is stored in the data of the data RAM 2. If you want to display the modified character,
Since the character data corresponding to that character must be read from the data area of data RAM 2 to the work area by inputting the file name, all character data stored in data ROM 1 must be corrected. In such cases, each time you modify the character data, you will give it a file name, and each time you display it, you will call it with that file name.
There was a problem that the operation became very complicated.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a display device in which character data can be easily modified and stored, and modified character data can be easily recalled, and the operability is greatly improved.

Means for Solving the Problems The present invention has a first storage means in which a plurality of character data are stored, and a memory capacity at least greater than the first storage means, and all characters stored in the first storage means. A second storage means in which data is stored in a readable/writable manner; and an address corresponding to the address where each character data is stored in the first storage means is divided into the second storage means, and each character data is stored in the second storage means. This is a display device characterized by including a transfer means for transferring and storing, and a display means for displaying each character data in the second storage means as character data 1.

If one addition is made to the present invention, the information person "q" can be transferred by means of transfer.
All the character data stored in is transferred to the second storage means by assigning an address corresponding to the address in the first storage means. Character data necessary for display is read from the second storage means by the same operation as the one used to read the character data.When saving the character data modified by the second storage means, The data is stored at the original address in the second storage means. However, regardless of whether it has been corrected or not, all character data is assigned an address corresponding to the address in the first storage means. is stored in the second storage means.

Embodiment FIG. 1 is a block diagram showing a general configuration of a display device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a more specific configuration of the display device. In FIGS. 1 and 2, a data ROM 1 serving as a first storage means
1 is a memory usually called a character generator in which a plurality of character data are stored, and a data RAM 12 which is a second storage means is a data RAM
This is a memory for storing character data successively output from the OM 11 as will be described later. The water entry part 13, which is a display means, is composed of, for example, a plasma display device,
It has a function to display characters according to character data.

3rd r7! 1 is a diagram showing a storage area of the data RAM 12 described above. This storage area is 1l of ROM for data.
a data area 12a that can store all character data stored in the data area L2a;
It also includes a work area 12b for storing and displaying character data successively generated from . Assuming that the screen of the display unit 13 can display NXM characters, the work area 12b of the data RAM 12 has at least N
A capacity is provided that can store data greater than the character data corresponding to the character of ×M IIN.

In FIG. 1 and FIG. 2, a transfer unit 1 which is a transfer means
4 has a function of reading all character data from the data ROM II and transferring it to the data area 12a of the data RAM 12. The CPU 15 selectively stores the character data transferred and stored in the data vA area 12a of the data RAM 12 into the work area 1 of the data RAM 12.
2b, a function to modify the character data read to the work area 12b, and a function to read the modified character data to the data r (data area 12 of AM12).
This is a central processing unit that has functions such as writing to the original address of a. Connected to this CP IJ 15 are a program ROM 16 in which programs for operating procedures for each of the above-described functions are stored, and an input section 17 that inputs commands for operating each of the above-described functions. This input section 17 is constituted by, for example, a keyboard.

As shown in FIG. 2, the transfer section 14 includes a switch 18 for instructing a transfer operation, and a data RO for transfer.
It consists of one counter that provides address signals to the MII and data RAM 12, and an oscillator 20 that generates a clock signal that is the basis of the operation of this one counter.

One terminal of the two-legged switch 18 is grounded, the other terminal is connected to the power supply Vcc, and the other terminal is connected to the reset terminals 1 to R of the counter 19 and the data ROM 1.
1 and the select terminals SEL of selectors 21 and 22, respectively.

One selector 21 appropriately selects the address data sent from the CPU 15 and the address data sent from the transfer section 14 according to the level of the select terminal SEL, and inputs the data into the data RAM 12. the other selector 2
2 is a chip select signal C8 sent from the CPU 15, a write signal (a signal that enables writing) WR, a read signal (a signal that enables reading) RD, and a transfer unit 1.
By appropriately selecting the chip select signal C8, write signal WR, and read signal RD of No. 4, the chip select terminal C3, write terminal WR, and read terminal RD of the data RAM 12 are selected.
Enter.

In the selector 22, the input terminal C3 for the chip select signal C8 on the transfer section 14 side is grounded, and the input terminal RD for receiving the read signal RD is connected to the power supply VcC.

That is, a low level signal is always given as the chip select signal C8 on the transfer section 14 side, while a high level signal is given as the read signal RD, and the transfer section 14 sends data to the data RAM 12. The configuration is such that reading is not performed.

For example, the least significant bit of the address data sent from the CPU 15 is converted by the decoder 23 and provided to the selector 22 as a chip select signal C3. Also,
The counter 19, which is a part of the transfer unit 14, is composed of, for example, a multi-bit binary counter, and receives a signal D1 obtained by inverting the output signal D1 of the least significant bit by the inverting circuit 24.
is applied to the output enable terminal OE of the data ROM 11 as an output enable signal, and further applied to the write signal input terminal WR of the selector 22 as a write signal. Output signal D2 of bits other than the least significant bit of counter 19. D3... are given to the selector 21 and the data RoM 11 as address signals.

FIG. 4 is a timing chart showing the operation of the above-described display device, and FIG. 5 is a flow chart showing the operating procedure. The operation will be explained below with reference to this timing chart and flow diagram.

First, the switch 18 of the transfer unit 14 is turned on (step s1). As a result, the signal input to the reset terminal R of the counter 19 is inverted from high level to low level, and the counter 19 starts counting. Start up. Further, a low level enable signal is input to the chip select terminal C8 of the data ROM 11, and a low level select signal is input to the select terminal SEL of the selector 21.22.
In step s2, the state in which a signal from the A side, that is, the CPU 15 side is selected and input to the data RAM 12, is switched to the state in which a signal from the B side, that is, the transfer section 14 side is selected and input to the data RAM 12. ).

In the counter 19 which has started the count-up operation, the output signal D1 of the least significant bit repeats high level/low level in the same layer as the clock signal given from the oscillator 20, as shown in FIG. 4(2). The output signal D1 is inverted by the inverting circuit 24, and the signal D1 shown in FIG.
and the write input terminal WR of the selector 22, respectively.

Further, as shown in FIG. 4 (4), the output signal D2 of the next bit of the counter 19 is the output signal D1 of the least significant bit.
The output signal D3, which is one bit higher than the output signal D3, is a waveform whose frequency is divided by two, and the output signal D4 which is one bit higher than the output signal D3 is a waveform, which is the frequency of the output signal D3 divided by two. These output signals D2 to D4
is given to the data ROMII as an address signal,
Furthermore, it is provided to the data RAM 12 via the selector 21 (step s3).

As a result, among the character data in the data ROM 11, the character data stored at the address designated by the address data is read out, and the character data stored in the data area 12a of the data RAM 12, which is also addressed by the address signal, is read out. The character data is stored at the address (step s
4).

The above operation is repeated every time the value of the counter 19 is incremented by 1, and all character data of the data ROM 11 is transferred to the data area 12 of the data RAM 12.
This continues until it is transferred to a (steps s5 and s6).
, after the transfer of all character data is completed, the switch 18 of the transfer section 14 is turned off (step S7),
The signal input to the chip select terminal C8 of the data ROM II switches to high level, and the data ROM II
II stops working. The select signal input to the select terminal SEL of the selector 21.22 also switches from low level to high level, and each selector 21.22
Select the signal from the side, that is, the CPU 15 side, and select the R for data.
The state is switched to input to AM12 (step s
8).

Next, when a call command for desired character data is input to the CPU 15 from the input section 17 (step S9), the address data corresponding to the character data is transferred to the CPU 15.
The specified character data is given from U15 to the data RAM 12 via the selector 21, and thereby the specified character data is called from the data area 12a of the data RAM 12 to the work area 12b of the same data RAM 12, and at the same time, the called character data A character corresponding to the character is displayed on the display unit 13 (step s10).
Since all character data is stored in ROM II and at the same address as the data ROM II, the operation is exactly the same as the operation of selectively recalling desired character data from the data ROM in a conventional display device. will be carried out.

When a desired modification command is input from the input section 17 to the CPU 15 while referring to the characters displayed on the display section 13, the data is sent from the CPU 15 to the data RAM via the selector 21.
Correction data is applied to the data RAM 12, and the character data read into the work area 12b of the data RAM 12 is corrected. Accordingly, the character displayed on the display section 13 also changes (step all).

For example, when one character is displayed as 16 x 16 dots, the following description will be based on a state in which character data corresponding to the standard character "1" is called from the data area 12a of the data RAM 12 to the work area 12b. . The character "1" is displayed on the display section 13 as shown in FIG. 6(1). If this character data is corrected to character data corresponding to the bold character "1", the character displayed on the display section 13 changes as shown in FIG. 6(2).

When the modified character data is to be used as standard character data from now on, input from the input section 17 to the CP
By giving a write command to the LI 5, the CPU 15 specifies the original address of the data area 12a of the data RAM 2 where the modified character data was stored before being modified, and thereby The modified character data is stored at that address (step 512).

After processing in this way, from the next time, for example, the input section 17
When a command to display the character "1" as a character is input to the CPU 15, the large-sized character 'IJ' will be displayed on the display section 13.

In the above embodiment, the transfer unit 14 is configured by the counter 19, etc., but the transfer unit 14 is not limited to this, and the same function may be provided by program control of the CPU 15 or the like. Further, in the above embodiment, the case where there is one RAM 12 for data has been explained, but the present invention is not limited to this. Multiple RAMs 12 for data may be prepared to store multiple types of modified character data for one standard character data. You may also be able to store it.

Effects of the Invention As described above, according to the display device of the present invention, there is no need to create a special file name to save modified character data, and all character data can be saved regardless of whether or not it has been modified. can be recalled without using a file name, making saving and recalling operations extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a general configuration of a display device which is an embodiment of the present invention, FIG. 2 is a block diagram showing a more specific configuration of the display device, and 3r2 is a block diagram showing a more specific configuration of the display device.
4 is a timing chart showing the operation of the display device, FIG. 5 is a flowchart showing the operation procedure of the display device, and FIG. 6 is an example of character modification. FIG. 7 is a block diagram showing a schematic configuration of a conventional display device. 11... ROM for data, 12... RAM for data
, 12 iL...first storage area, 12b...second storage area
Record +1! Head area, 13...Display section, 14...Part of data copy, 15...CPU, 16...-Program R
OM,】7... Input Department Agent Patent Attorney Keiichi Nishikyo Figure 3 Figure 5

Claims (1)

[Scope of Claims] A first storage means in which a plurality of character data are stored; and a first storage means having a storage capacity at least greater than the first storage means, from which all character data stored in the first storage means can be read/written. a second storage means for storing freely; a transfer means for allocating an address corresponding to an address where each character data is stored in the first storage means to the second storage means to transfer and store each character data; A display device comprising display means for displaying each character data stored in the second storage means in a character font.