JPH0344696A - Display device - Google Patents

Abstract

PURPOSE:To simply and easily perform lateral double size display by controlling a parallel/serial(PS) converting device which parallel/serial-converts data outputted from a character generator in accordance with the lateral double size specifying information of an attribute memory. CONSTITUTION:Displayed character information formed by a code memory 1 and the character generator 2 is converted to serial data by the PS converting device 7 to display a character and a mark, etc., on a display unit 8. The data fetching timing and the conversion of the device 7 are controlled by a clock outputted from a timing clock generation means 4 based on the specified lateral double size data from the attribute memory 3 and a basic clock. With such constitution, a lateral double size character is not monopolized by the character generator and the lateral double size display is simply and easily performed only by specifying a desired lateral double size to the attribute memory.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a display device used in a Japanese word processor or the like.

2. Description of the Related Art Conventionally, as a display device of this type, the configuration shown in FIG. 4 is known. In FIG. 4, 31 is a code memory that stores a character code, 32 is a character generator that stores characters corresponding to the character code specified by the code memory 31, and 33 is a character generator that is read out from the character generator 32. This is a display screen on which characters are displayed.

Next, the display operation of n-width characters according to the conventional example will be described.

Under the control of the CPU, a horizontal triple-width character, for example, is divided into areas for three characters and stored in the character generator 32, and a horizontal triple-width character divided into three character areas, such as A, B, and C, is stored in the code memory 31. The display character code of the double-width character is stored at a location on the display screen 33 corresponding to the position to be displayed, and the character code specified by the code memory 31 in the character generator 32 is displayed on the display screen 33.
can be displayed.

In this way, even the conventional display device described above can display n-width characters under the control of the CPU.

Problems to be Solved by the Invention However, in the conventional display device described above, since it is necessary to generate a pattern of n-width characters by the CPU, the C
Large overhead of PU occurs. Also, when displaying n-width characters, the character generator 3
2 for n characters, which caused problems such as being uneconomical.

The present invention solves these conventional problems, and enables the CPU to display double-width characters according to the double-width number simply by specifying the double-width display.
The object of the present invention is to provide a display device that can reduce the overhead of U, eliminate the need for a character generator to be used exclusively for double-width characters, and improve economic efficiency. .

Means for Solving the Problems In order to achieve the above object, the present invention provides a display means, a code memory for storing a character code corresponding to each character on a display screen of the display means, and an attribute for storing character attributes. a memory, a character generator that outputs parallel data in order to display characters corresponding to character codes sequentially read from the code memory on the display means, and converts this parallel data output into a serial signal and sends it to the display means. The acquisition timing of the parallel to serial converter and the conversion clock to serial data are determined by the basic clock or horizontal double angle display specification information of the desired horizontal double angle number sent from the basic clock and the attribute memory. The system is equipped with a timing clock generating means for generating a timing clock.

Therefore, according to the present invention, when the CPU specifies horizontal double-width display of a desired horizontal double-width number for the attribute memory, the character generator outputs the character of the character code specified by the code memory as parallel data; When this parallel data is taken into the parallel-to-serial converter and converted, the timing clock generation means generates the take-in timing and conversion clock according to the specified horizontal double angle number, so that the output of the parallel-to-serial converter is , the signal is synchronized with the conversion clock, and a desired number of horizontal double-width characters can be displayed on the display means.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 is a functional block diagram showing a display device in an embodiment of the present invention. In FIG. 1, 1 is a code memory in which character codes of displayed characters are stored by a CPU (not shown) at a location corresponding to a display position on a display screen of a display device 8, which will be described later. A character generator 2 is accessed using the output of the cordless memory 1 as an address, and outputs parallel data for character display.

3 is an attribute memory that stores character attributes;
The CPU specifies horizontal double-angle display of a desired horizontal double-angle number. Reference numeral 4 denotes timing clock generation means, into which the basic clock 5 or the basic clock 5 and horizontal double-angle display designation information 6 of the output of the attribute memory 3 are input. Reference numeral 7 denotes a parallel-to-serial converter, in which the parallel data of the character generator 2 is manually input, and its fetch timing and conversion clock are given by the timing clock generating means 4. A display 8 displays characters based on the output of the parallel/serial converter 7.

Next, the operation of the above embodiment will be explained with reference to timing charts shown in FIGS. 2(a) and 2(b).

Since double-width display designation information 6 is not output from the attribute memory 3 for characters for which double-width-width display is not specified by the CPU in the attribute memory 3, the timing clock generating means 4 outputs the basic clock to the parallel-to-serial converter e7. (See Figure 2 (a)) Conversion clock with the same cycle as 5 (See Figure 2 (di)) and parallel data output of the character specified by the code memory 1 in the character generator 2 (See Figure 2 (b)) ) is provided (see FIG. 2 (see C1)).

The output of the parallel-to-serial converter 7 is a serial signal (see FIG. 2(e)) synchronized with the basic clock 5, and characters are normally displayed on the display screen of the display 8.

On the other hand, since the CPU outputs double-width-width display designation information 6 from the attribute memory 3 for characters for which double-width-width display is specified, for example, the timing clock generating means 4 uses this horizontal-width display designation information 6. Double-angle display specification information 6 and basic clock 5 (Figure 3(a)
) is input, and the parallel-to-serial converter 7 is given a period twice the normal display in the parallel data output (see FIG. 3(b)) of the character specified by the code memory 1 in the character generator 2. The capture timing (see Figure 3 (C1)) and the conversion clock (see Figure 3 (d+) are given. The output of the parallel-to-serial converter 7 is a serial signal (see Figure 3 (e)) synchronized with the conversion clock.
), and double-width characters are displayed on the display screen of the display 8.

In the above embodiment, the case where the horizontal double-angle display specification of the attribute memory 3 is 2 times has been explained, but this is
Even if it is twice as long, it can be realized by making the capture timing output and the conversion clock output of the timing clock generating means 4 to the parallel-to-serial converter 7 have a period n times that of the normal display.

In this manner, according to the above embodiment, the CPU can display a desired n-width double-width display in the attribute memory 3 without occupying the area for n characters in the character generator 2. Characters can be displayed.

Effects of the Invention As described above, according to the present invention, when the CPU specifies horizontal double-width display of a desired number of horizontal double-width characters in the attribute memory, the character code specified by the code memory is transferred from the character generator in parallel. When outputting the parallel data as data and importing and converting this parallel data into a parallel-to-serial converter, the timing clock generation means generates the import timing and conversion clock according to the specified horizontal double angle number. The output of the conversion device becomes a signal synchronized with the conversion clock, and the display means can display a desired number of double-width characters, so the CPU can display the desired number of double-width characters in the attribute memory. Double-width characters can be displayed just by specifying them, and the CPU overhead can be minimized. Furthermore, even when displaying a desired number of horizontal double-width characters, the exclusive character area of the character generator only needs to be for one character, and there is no need to display double-width characters, which is economical.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing a display device according to an embodiment of the present invention, FIG. 2 is a timing chart when normal characters are displayed according to the above embodiment, and FIG. 3 is a horizontal 2
FIG. 4, a timing chart for double-angle display, is a functional block diagram showing a conventional display device. DESCRIPTION OF SYMBOLS 1... Code memory, 2... Character generator, 3... Attribute memory, 4... Timing clock generation means, 5... Basic clock, 6...
Double-width horizontal display designation information, 7...Parallel/serial converter, 8...Display device.

Claims (1)

[Claims] a display means, a code memory for storing character codes corresponding to each character on the display screen of the display means, an attribute memory for storing character attributes, and displaying the characters corresponding to the character codes sequentially read from the code memory. A character generator outputs parallel data to be displayed on the display means, and a parallel generator converts the parallel data output into a serial signal and sends it to the display means.
A serial converter and a basic clock, or a horizontal double angle display designation information of a desired horizontal double angle number sent from the basic clock and the attribute memory, generate the acquisition timing of the parallel/serial converter and a conversion clock to serial data. A display device equipped with timing clock generation means.