JPH0816148A - Display data forming method - Google Patents

Abstract

PURPOSE:To miniaturize a character generating circuit without impairing the easiness of visibility of display data on a screen by modifying and displaying display data while arranging shade dots in the downward, in the adjacent right and in the inclined right adjacent of signaficant dots expressing a character or a sign or a graphic among dot patterns. CONSTITUTION:Display data are modified and displayed by arranging shade dots in the downward (A), in the right adjacent (B) and in the inclined right adjacent (C) of character dots expressing characters among dot patterns. That is, a shade dot generating circuit outputs as shade dots with respect to dots outputted successively by a shift register when dots to be outputted next is character dots or either dots outputted at the same time as the dots of (n) line by an (n-1)th line shift register or dots outputted next to these dots are character dots. In such a manner, the shades ate, added in the downward (A), in the adjacent right (B) and in the lower right (C) of the character dots according to a shade output consisting of a character output and shade dots and then a character provided with shades 1 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of creating display data, and can be applied to the case of outputting characters using shaded characters to a display device such as a display.

[0002]

2. Description of the Related Art Conventionally, a character displayed on a screen called an OSD (on screen display) character is
Shadow dots are arranged all around the character dots so that the characters are easy to see when they are displayed on the image. That is, as shown in FIG. 5, by arranging shadow dots around the character dots, the characters are modified so that white characters can be easily seen on a white screen, for example.

[0003]

However, in such a conventional character modification method, since the shadow dots are arranged all around the character dot, the display line is used to judge whether or not to shadow the character dot. And a total of three lines of display data before and after the display line must be read simultaneously. That is, as shown in FIG. 6, in a dot having no character dot, it is necessary to check whether or not the character dot is arranged in the dot surrounding the dot. Therefore, in the conventional character modification method, since data for three horizontal lines for one character is required, a memory for storing data for three lines is required, which causes a problem that the scale of the arithmetic circuit becomes large. .

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a display data creating method capable of miniaturizing a character generating circuit without impairing the visibility of characters on a screen. .

[0005]

In order to solve such a problem, in the present invention, in a display data creating method for shadowing a dot pattern of display data consisting of characters, symbols or figures to be displayed on a screen, Data for two lines are stored in the memory means ((9), (10)), and shadow dots are arranged below, to the right of and adjacent to the right of the significant dot representing a character or symbol or figure in the dot pattern, and display data is displayed. Changed to display.

[0006]

Two lines of the dot pattern of the display data consisting of characters, symbols or figures are stored in the memory means ((9), (1
0)), the shadow dots are arranged below, to the right of, and diagonally below, the significant dots that represent characters, symbols, or figures in the dot pattern so that the display data is modified and displayed. The character generation circuit can be downsized without impairing the visibility of the display data above.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 generally indicates an embodiment of a shaded character (numeral "8") created by the display data creating method of the present invention. In the display data creating method of the present invention, shadows are drawn below the character dot representing the character in the dot pattern (FIG. 1A), next to the right (FIG. 1B) and diagonally lower right (FIG. 1C). Dots are arranged so that the display data is modified and displayed.

FIG. 2 shows a character generation circuit 2 which realizes the display data generation method of the present invention. In the character generation circuit 2,
Serial data is input to the serial data control unit 3 from outside the serial data control unit 3. The serial data includes display position information that specifies the display position of characters on the screen, character information regarding what characters are displayed on the screen, and character decoration that determines whether a shadow is added to the displayed characters. Information etc. are included. Of these information, display position information and character information are video RAM (random
access memory) 4 and the character decoration information is output to the character decoration control register 5.

The position of the screen is assigned to the address of the video RAM 4, and the address is designated by the display position information of the character output from the serial data control section 3, whereby the display position of the character on the screen is designated. Is determined. A character code corresponding to the character information output from the serial data control unit 3 is stored in the video RAM 4, and a dot pattern of the character corresponding to the character code is stored in the video ROM (read only memory) 6. ing. Therefore, when the video RAM 4 receives the display position information and the character information from the serial data control unit 3, the character code corresponding to the character information is output from the video RAM 4 to the video ROM 6, and the dot pattern corresponding to the character code is output from the video ROM 6. It is output to the shadow dot generation circuit 8 built in the output controller 7.

The shadow dot generation circuit 8 determines whether to cast a shadow on a character based on a signal from the character decoration control register 5. That is, when the shadow dot generation circuit 8 receives the character decoration signal from the character decoration control register 5, the video R
Based on the dot pattern received from the OM 6, character output and shadow output for one horizontal line of one character are sent in the form of pulses.

FIG. 3 shows a schematic configuration of the shadow dot generation circuit 8. In the shadow dot generation circuit 8, the nth line shift register 9 stores the nth line of the dot pattern for one character read from the video ROM 6, and the n-1th line shift register 10 stores the n-1th line. Store. These shift registers 9 and 10 shift the shift registers 9 and 10 to the right and sequentially output dots in synchronization with the character output dot clock. In this case, the shift registers 9 and 10 output a pulse signal of level "1" when the dot to be output is a character dot and a pulse signal of level "0" when the dot is not a character dot.
Accordingly, the shift registers 9 and 10 output a character output corresponding to the presence or absence of character dots in one horizontal line of one character as a pulse signal.

The character output corresponding to the dot pattern of the nth line output from the shift register 9 is a relay type latch circuit 11 and a logical sum circuit (OR circuit) 1 of 2 input terminals.
2 and the latch circuit 11 latches one dot clock and sends a character output. On the other hand, the character output corresponding to the dot pattern of the (n-1) th line output from the shift register 10 is output to the relay type latch circuit 13 and the OR circuit 14 having two input terminals, and the latch circuit 13 is the same as the latch circuit 11 in the dot clock. To output a character output to the OR circuit 14. O
The R circuit 14 calculates the character output output from the shift register 10 and the character output output from the latch circuit 13.

Since the OR circuit 14 operates on the character outputs whose dots sequentially output from the shift register 10 are deviated one by one, (A) and (C) in FIG.
As described above, in the case of the dot of n-1 line, when the dot is a character dot, a calculation is performed such that shadow dots are arranged below the dot and diagonally lower right. That is, the shift register 10
When the dot output at the same time as the line dot or the dot output next to the dot is a character dot, it is output as a shadow dot. The character output obtained by the OR circuit 14 is output to the OR circuit 12, and the OR circuit 12 calculates the character output output from the OR circuit 14 and the character output output from the n-th line shift register 9.

The character output resulting from the operation of the OR circuit 12 is output to the OR circuit 15 having two input terminals.
Then, the character output from the latch circuit 11 and OR
An operation is performed on the character output output from the circuit 12.
Here, in the OR circuit 15, the character output output from the shift register 9 and the character output output via the latch circuit 11 and output from the shift register 9 to the OR circuit 15 are shifted by one dot. The character output will be calculated.

Therefore, the OR circuit 15 outputs the dot output from the shift register 9 as a shadow dot when the next output dot is a character dot. That is, in the shadow output output from the OR circuit 15,
As shown in FIG. 1B, the shadow output is such that the shadow dot is arranged on the right side of the character dot. Here, as shown in FIG. 4, the shadow output must be the level "1" even if the character output level is "1".
Is required.

In the above configuration, the shadow dot generation circuit 8
Then, with respect to the dots sequentially output by the shift register 9, when the next dot to be output is a character dot, or the dot output from the n-1th line shift register 10 simultaneously with the dot of the n line or the dot next to the dot. When one of the dots to be output is a character dot, it is output as a shadow dot. Thus,
According to the shadow output consisting of the character output and the shadow dot, a shadow is added below, to the right of the character dot, and diagonally to the lower right, and a shaded character 1 as shown in FIG. 1 is created.

According to the above construction, calculation is performed based on the dot patterns for two lines, that is, the n line and the n-1 line of the dot pattern for one character, and the dot pattern is located below, to the right of the character dot, and diagonally to the lower right. By arranging the shadow dots, the character generation circuit can be downsized without impairing the visibility of the characters on the screen. Therefore, it is particularly effective for a system such as a microcontroller having a built-in character generation circuit in which the font data length read at one time is limited.

In the above-mentioned embodiment, the case where the display data creating method according to the present invention is applied to the character "8" has been described, but the present invention is not limited to this, and is applicable to display data such as characters, symbols or figures. Applicable.

[0020]

As described above, according to the present invention, two lines of the dot pattern of the display data consisting of characters, symbols or figures are recorded in the memory means, and the characters, symbols or figures of the dot pattern are significant. By arranging shadow dots below, to the right of the dot, and diagonally below the dot to display the display data, the character generation circuit can be miniaturized without impairing the visibility of the display data on the screen. be able to.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a shaded character created by a display data creating method of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a character generation circuit.

FIG. 3 is a block diagram showing a schematic configuration of a shadow dot generation circuit.

FIG. 4 is a waveform diagram showing signal waveforms of character output and shadow output.

FIG. 5 is a schematic diagram for explaining a conventional character modification method.

FIG. 6 is a schematic diagram for explaining a position of a shadow dot in a conventional character modification method.

[Explanation of symbols]

1 ... Shaded characters, 2 ... Character generation circuit, 3 ... Serial data control unit, 4 ... Video RAM, 5 ... Character modification control register, 6 ... Video ROM, 7 ... Output controller, 8 ... ... Shadow dot generation circuit, 9 ... n line shift register, 10 ... n-1 line shift register, 11,13 ... Relay type latch circuit, 12,14,
15 ... OR circuit.

Claims (2)

[Claims] 1. A display data creating method for casting a shadow on a dot pattern of display data consisting of characters, symbols or figures to be displayed on a screen, wherein two lines of the dot pattern are stored in a memory means and the dot pattern of the dot pattern is stored. A display data creating method, characterized in that shadow dots are arranged below, to the right of, and diagonally to the lower right of a significant dot representing the above-mentioned character, symbol, or figure to modify and display the above-mentioned display data. 2. The memory means comprises first and second shift registers for respectively storing one line of the dot pattern, and the first shift register for storing the nth line of the dot pattern is rightward. To sequentially output the dots as a dot pattern, and when the dot to be output next for the dot is the significant dot, or the second shift register for storing the (n-1) th line of the dot pattern. , When either the dot output simultaneously with the n-line dot or the dot output next to the dot is the significant dot,
2. A shadow dot is output, and a shadow is formed below, to the right of the significant dot, and diagonally to the lower right of the significant dot according to the dot pattern and the shadow dot pattern consisting of the shadow dot. Display data creation method.