JPH02166498A - Character display device - Google Patents

Abstract

PURPOSE:To easily vary the intervals of characters to be displayed at a high speed by providing a character pitch memory stored with the interval between a display character and a next adjacent character additionally to the character code and controlling the output width of a clock generator according to the character pitch of the output of the memory. CONSTITUTION:The output interval of the output character clock 1a of the clock generator 1 which determines the scanning time of one character is controlled by a wait signal 8a which is generated for each display character. The display interval of the character display of a display device 6, on the other hand, is controlled with the output character clock 1a of the clock generator 1. Therefore, the character display interval on the display device 6 can be varied by varying the level of the wait signal 8a and the output interval of the character clock 1a. Consequently, the character pitch of the display can easily be varied fast.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a character display device used in word processors, personal computers, information processing terminals, and the like.

(Prior Art) Conventional character display devices used, for example, in word processors have the following two configurations (a) and (b).

(a) A code memory that stores a character code and a character generator that stores a character pattern corresponding to the character code are provided and are allocated to each fixed area on the display screen. A configuration in which a character code corresponding to the address of the code memory is read out, and a character pattern of a character generator corresponding to the character code is read out and displayed.

(b) A configuration in which a video memory corresponding to all display pixels of the screen is provided, and necessary character patterns are written directly into the video memory and displayed.

(Problem A to be Solved by the Invention) However, all of the above methods have the following problems.

That is, in the configuration (a), the spacing between characters is fixed in advance and cannot be changed. Further, in the configuration (b), although it is possible to change the character spacing, if the spacing is changed even by one character, the positions of all character patterns after the changed character change.

Therefore, it is necessary to rewrite many parts of the video memory, and the rewriting requires an extra long time.

In view of the above, the present invention solves the above-mentioned conventional problems in character displays. Less me.

The purpose of the present invention is to provide a character display device in which the digit pitch of characters can be changed by memory rewriting.

(Means for Solving the Problems) The present invention aims to achieve the above-mentioned object in a character display device that is equipped with a character code memory storing nine display character codes and that displays characters by raster scanning. This is achieved by providing a character pitch memory that stores the interval between a displayed character and the next character adjacent to it, and controlling the output width of the clock generator based on the output character pitch.

(Function) According to the present invention having the above configuration, by changing the value of the character pitch memory, it becomes possible to easily and quickly change the digit spacing of displayed characters.

(Embodiment) The drawing is a block diagram showing the configuration of an embodiment of the present invention. Reference numeral 1 denotes a clock generator which supplies a basic clock 1a to the display address control circuit 2, which uses a scanning time unit of one character in the scanning time as a character clock.

The display address control circuit 2 sends a character address signal 2a indicating the number of the character on the display screen to the character code memory 3, and a row indicating the number of scanning of the character in one line to the character code memory 3. The address signal 2b is sent to the character generator 4.
Output to.

The character code memory 3 inputs a character code signal 3a whose address is the character address signal 2a to a character generator 4 that stores a one-character pattern, thereby generating a character code signal 3a whose address is the character code signal 3a and the row address signal 2b. The character pattern signal 4a for one character in one scanning line of the display screen is sent as a parallel signal to the parallel-to-serial conversion circuit 5.
It is applied to the parallel-to-serial conversion circuit 5, which converts it into a serial video signal 5a, and converts it into a serial signal.
The information is displayed on a display device 6 such as a liquid crystal display or a liquid crystal display.

A character pitch memory 7 stores the interval between each character on the display screen and the next character, and outputs a character pitch 7a. Reference numeral 8 designates a weight generation circuit for inputting a wait signal 8a to the clock generator 1 for a period of time when the character pitch 7a is applied and its value is larger than the minimum character pitch that is the character width.

The present invention configured in this way has a clock generator 1
Or display device! 6 is the same as the conventional character display device. First, the operation is started by the clock signal from the clock generator 1, and the display address control circuit 2 inputs the character address signal 2a to the character code memory 3, and the display address signal 2a is input to the character code memory 3. Character code signal 3a is input to character generator 4. The character generator 4 reads a character pattern 4a based on the input character code signal 3a and the row address signal 2b from the display address control circuit 2, and the zero character pattern 4a input to the parallel-serial conversion circuit 5 is formed as a parallel signal. Here it is converted to a serial signal and displayed! 6 is entered,
Characters corresponding to the two-character code signal 3a are displayed.

The present invention comprises a character pitch memory 7 to be described below, a weight generation circuit 8 that generates a weight signal 8a according to the contents of the memory, and a weight signal 8 outputted from the character pitch memory 7.
A feature of the clock generator 1 is that it changes the clock signal output according to a.

That is, the output interval of the output character clock 1a of the clock generator 1, which determines the scanning time for one character, is controlled by the wait signal 8a generated for each display character. On the other hand, since the display interval of the character display on the display device 6 described above is controlled by the output character clock la of the clock generator 1, the magnitude of the wait signal 8a is changed and the output interval of the character clock 1a is controlled. 1 by changing
Display bag! By changing the value of the character pitch 7a output from the character pitch memory 7, the magnitude of the weight signal 8a is changed, and the displayed character interval can be changed. Become.

(Effects of the Invention) As described above, the present invention has a character pitch memory in addition to the conventional code memory, and the output width of the clock signal is changed according to the value of the character pitch memory. By controlling the clock signal width easily.

Moreover, it has the effect of being able to change the character spacing displayed at high speed.

[Brief explanation of the drawing]

The drawing is a block diagram showing one embodiment of the present invention. Eight generation circuit.

Claims (1)

[Claims] Equipped with a character code memory that stores display character codes,
In a character display device that displays characters by raster scanning, a character pitch memory is attached to the character code and stores the interval between the next character adjacent to the displayed character, and the output character pitch is used to generate a clock generator. A character display device characterized in that the output width of the character is controlled.