JPS6075869A - Dynamic expansion character display system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an enlarged character display method in a character display device, and more particularly to a dynamic enlarged character display method.

Conventionally, in this type of character display device,
In order to realize double or quadruple character display,
Reads a dot pattern twice or four times the size of a character from read-only memory or random access memory,
It was supplied when the system was started up. In such a conventional method, memory capacity for the number of characters is required, so providing all the necessary turns for double or quadruple enlargement of kanji etc. requires a large memory capacity for character generation. However, there was a drawback that the amount of high-speed writing increased. On the other hand, when the external storage device has a character number turn, there is a problem in that a disk device or the like is required and the system becomes larger.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the drawbacks of the prior art by providing a read-only memory for storing basic character patterns as well as a pattern expansion logic section for selecting an expansion pattern image corresponding to 11 character patterns. Dynamic enlarged characters are configured so that they can be displayed using a small capacity random access memory for character generation without having to prepare all enlarged character patterns in order to display enlarged characters of kanji. The objective is to provide a display method.

The dynamic enlarged character display method according to the present invention includes a read-only memory, a pattern enlargement logic section, a random access memory for generating one character, and a refresh memory,
The present invention is characterized in that it is realized by configuring the same dynamic area to be used as a character generation area for enlarged characters for each display screen. Read-only memory is
It is used to store basic patterns of character information.

The pattern enlargement logic section comprises a plurality of data selectors for rapidly selecting an enlarged pattern image of a character pattern in response to the character pattern from the read-only memory. The random access memory for character generation can be rewritten immediately before a refresh operation, and is used to dynamically develop an enlarged pattern image of a character pattern. Refresh memory is
By writing a character designation code when the expansion in the pattern expansion logic section is completed, the designated area of the random access memory for character generation is accessed and expanded.

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an apparatus for realizing the dynamic enlarged character display method according to the present invention. In FIG. 1, 1 is a central processing unit, 2 is a fresh memory,
3 is a random access memory for character generation, 4 is a parallel/serial type shift register, 5 is a pattern expansion logic section, and 6 is a basic turn memory.

In FIG. 1, an enlarged pattern image of a character pattern selected at high speed by a high-speed pattern enlargement logic unit 5 corresponding to a character pattern stored in a basic pattern memory 6 is used for character generation via a central processing unit 1. Dynamically expanded on the random access memory 6. A dot pattern is sequentially written in a dynamically expanding area on the random access memory 6 for character generation, and when the expansion is completed, a character designation code is written in the refresh memory 2 and the specified area of the random access memory 60 for character generation is written. access. Similarly, the enlarged character expansion area of the random access memory for character generation 3 is rewritten immediately before the contents of the refresh memory 2 are refreshed next time. With the above configuration, by using the same area as a character generation area for enlarged characters on each screen, it is possible to display many types of enlarged characters such as Chinese characters with a small memory capacity.

FIG. 2 is a diagram showing the configuration of one embodiment of the pattern expansion logic unit 5 together with the character generation reading υ-only memory 7 constituting the basic pattern memory 6. In FIG. 2, reference numeral 7 indicates a read-only memory for character generation, and reference numerals 8 to 10 indicate first to third data selectors constituting the pattern expansion logic section 5. In FIG. 2, data read from read-only memory 7 is input to first to third data selectors 8-10.

Necessary data is selected by the first to third data selectors 8 to 10 by the select signal on the signal line 101, and the decoded dot data is sent to the first to third data selectors 8.
~10 is output. First to third data selector 8
-10, the horizontal dot data of normal characters or enlarged characters is selected by coding according to the horizontal enlargement rate, and the vertical enlargement is achieved by repeatedly reading the same data. are doing. With the above configuration, necessary characters (turns) are generated by a high-speed writing method.

As explained above, in the present invention, even if the number of displayed character types increases due to double or quadruple enlargement, the capacity of the two random access memory for character generation does not increase, and it is possible to realize enlarged character display. Since the generation of the enlarged character pattern is realized by the high-speed writing method, it has the effect of being faster than when it is executed by software.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment for realizing a dynamic enlarged character display method according to the present invention. FIG. 2 is a block diagram showing the groove structure of one embodiment of the pattern enlarging annular portion shown in FIG. 1. FIG. 1...Central processing unit 2...Refresh memory 3...Random access memory for fist character generation 4...Parallel/serial type shift register 5...Pattern expansion ring section 6...Basic pattern memory 7・Read-only memory for character generation 8 to 10... Data selector patent applicant NEC Corporation representative Patent attorney Hisashi Inoro

Claims (1)

[Claims] A pattern consisting of a read-only memory for storing a basic pattern of character information, and a plurality of data selectors for selecting an enlarged pattern image of the character pattern at high speed in response to the character pattern from the read-only memory. an enlargement logic section; a random access memory for character generation whose contents can be rewritten immediately before a refresh operation and for dynamically developing an enlarged pattern image of the character pattern; and an expansion in the pattern enlargement logic section. It is equipped with a refresh memory for accessing and expanding the designated area of the random access memory for character generation by writing a character designation code at the time of completion, and the same dynamic area is displayed for enlarged characters for each screen. A dynamic enlarged character display method characterized by being realized by configuring it to be used as a generation area.