JPS5853339B2 - Display method of enlarged characters - Google Patents

Description

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

In order to display characters on a cathode ray tube CRT, so-called electron beam scanning is required, in which the electron beam emitted from an electron gun is moved over time to assemble an image.

In a normal CRT display device, only one point on the display screen is lit at any given moment, so it is necessary to repeatedly display f points in order to create a static screen for a human being. is called refreshing.

The number of flash lags required for humans to avoid eye flickering is 30 to 60 times/second.

Therefore, in a normal CRT, the memory for repeated display (this is refreshed) is used.

This requires high-speed display capability to prevent flickering (flickering).

A conventional character display device using a dot matrix method using raster scanning is shown in block diagram 1 of FIG.

In FIG. 1, an interface control section 1 controls connection 1 of a central processing unit CPU to a channel, and controls data exchange with the CPU.

The buffer memory 2 stores data sent from the channel as character codes, and accumulates data for repeatedly displaying images on the CRTJ without flickering.

From the buffer memory 2, one piece of data is periodically read out by the cursor control section 5 and sent to a character generator (character generation section) 31.

The character generator 3 receives data in the form of a character code and converts it into a character image on the CRTn.

Characters are represented by, for example, a matrix of 7 dots horizontally by 9 dots vertically, and this is stored in a semiconductor fixed memory device.

This is read out in synchronization with the synchronizing signal from the synchronizing signal generating circuit 6, and the horizontal deflection circuit 8 and vertical deflection circuit 91 modulate the electron beam.

As a result, it is displayed as a character image on the CRTJ.

I represents a video signal amplification circuit.

A light pen or a keyboard (keyboard) is connected to the character display device 1 as an input device.

The light pen detects the address pointed on the screen based on the timing when a light-receiving element such as a phototransistor at the tip detects an electron beam.

The keyboard is used for inputting characters and editing the screen using a typewriter-like keyboard.

Most CRTs are 9 to 23 inches, and most of them are 12 to 14 inches, and the number of displayed characters is 500 to 30,000, especially 10.
Many of them are between 00 and 2000 characters.

There is also a display device that uses a direct-view storage tube, in which the CRT itself has a memory function and has low brightness but high resolution.

The character display device 1 is generally required to display a large number of characters, but on the other hand, in order to display headings on the display screen 1, it is required to display the headings in a large size.

These conflicting demands cannot be achieved with a display device in which the number of displayed characters and the size of the characters are fixed, but it is required to achieve these demands with a single display device.

However, as mentioned above, character display devices generally have the disadvantage that the number of displayed characters and character size are fixed.
Displaying a mixture of characters with different character sizes on one display screen required a new way of thinking about rows and columns on the display screen.

In view of the above-mentioned points, it is an object of the present invention to display characters enlarged by an arbitrary number of times, and to easily control the enlargement of at least one character unit, so that E can be enlarged to a plurality of different sizes on a display screen. An object of the present invention is to provide an enlarged character display method that can display large characters.

The present invention provides a memory that stores a plurality of character codes to be displayed, a character generator that generates a character pattern corresponding to the character code E output from the memory, and a character generator that generates a character pattern that corresponds to the character code E output from the memory. In a display device having a display unit that displays a character pattern, the display device includes a first means for specifying a vertical magnification of the character pattern, a second means for specifying a horizontal magnification of the character pattern; the memory for storing control information including control bits specifying whether or not to enlarge at least one character code E in the vertical and horizontal directions; determine the control bit of the control information output from the memory,
and determining means for validating information from the first or second means based on this result, the information being output from the character generator in correspondence with the at least one character code, and determining the information from the first means or the second means. The display unit is configured to apply an enlarged character pattern to the display unit according to information from the display unit.

The present invention will be described in detail below with reference to Drawing I.

FIG. 2 is a block diagram of a raster scan type character display device to which the enlarged character display method of the present invention is applied.

In FIG. 2, an oscillator circuit 10 generates one dot period of a character, and a period dot counter 11 counts the number of dots of one character.

The raster counter 12 counts the number of rasters in one line and is used as a read address of the character generator 1T.

The processing device 14 writes and reads character codes to and from the refresh memory 15 via the address switch 13, and also specifies the magnification values of the vertical magnification register 18 and the horizontal magnification register 23f.

The refresh address 31 is read from the refresh memory 15 through the address switch 13, and its character code is latched into the memory read register 16.

This read character code is converted into a character code along with the raster address selected by the raster switch 211.
The character pattern corresponding to the character code 1 given as the address of the generator IT is output from the character generator IT, and this read pattern is used to select a dot based on the dot address selected by the dot switch 26#. The dot readout register 291 is latched through the circuit 28, and the output is sent to the CRT 30f as one dot of a character pattern.

The value specified by the vertical magnification register 181 is divided by the vertical magnification E by the vertical magnification counter 19 and counted by the raster address counter 20, and this value and the value of the raster counter 12 are It is provided by a vertical expansion flip-flop 22 through a raster switch 21 as the address of the character generator IT.

The value specified by the horizontal magnification register 23I is divided into dots by the horizontal magnification counter 241 according to the horizontal magnification E, and counted by the dot address counter 25, and this value and the value of the dot counter 11 are The horizontal expansion flip-flop 271 is applied to the dot selection circuit 281 through the dot switch 26, and the character pattern of the character generator 1T is selected.
The dot read register 291 is latched.

FIG. 3 shows the refresh rate when the enlarged character display method of the present invention doubles the horizontal and vertical directions.
Character 33 and enlargement control characters 34 to 3T in memory 15
FIG.

The horizontal magnification register 23 and the vertical magnification register 18 are set to 2 magnification f, and as shown in FIG. The control character 35 or 31 that specifies the horizontal magnification causes two character strings to be treated as one character string when horizontally enlarged.

FIG. 4 is a display command, and is a diagram showing the character code of the refresh memory 15 and the bit format of the control character.

In FIG. 4, when b8 of data bit 32 of refresh memory 15 is "0", character code 33
When b8 is II 11+, it means an enlargement control character, bO means a horizontal magnification, and bl means a vertical magnification.

As for control characters, as shown in Figures 3 and 4, 34 is horizontal, without vertical magnification, 35 is with horizontal magnification, 3
6 represents the arrangement of control characters and the bit format in each case with vertical magnification and 3T with horizontal and vertical magnification.

Figure 5 shows data 3 in the refresh memory in Figure 3.
8 is displayed on a screen 39.

Figure 6 shows the dot counter 11, dot address
counter 25, raster counter 12, raster address counter 20 and vertical expansion flip-flop 2
2 is a diagram showing the operation of the horizontal enlargement flip-flop 2T and the enlarged display of the fraction rHJ when the values of the horizontal magnification register 23 and the vertical magnification register 1B are set to 2 magnification.

As shown in FIG. 6, when the vertical expansion flip-flop 22 is set to II II, the value of the raster address counter 20 is selected by the raster switch 211, and the raster address of the character generator IT is selected. Then, the raster address as shown in Figure i is repeatedly read out (DO-toto'').

When the vertical expansion flip-flop is "OI+", the value of raster counter 12 becomes the raster address (from 0 to
10).

When the horizontal expansion flip t-flop 2T is "I II", the value of the dot address counter 25 is similarly selected by the E dot switch 26, and the character pattern of the character generator 11 is selected by the dot address counter 25f. The corresponding pattern is read out repeatedly through the dot selection circuit 28 (00-88).

When the horizontal expansion flip-flop 21 is at II OII, the value of the dot counter 11 is selected and becomes the dot address (0-8).

FIG. 7 is a diagram showing the correspondence between the raster addresses (0-10) and dot addresses (0-8) of the character pattern rHJ of the character generator 17#.

According to the present invention as described above, in the character display device 1 on which a plurality of character patterns are displayed, the character patterns can be arbitrarily moved vertically and horizontally by the first means and the second means. You can specify to enlarge to a magnification of .

Furthermore, control information specifying whether or not to enlarge vertically and horizontally is stored in one refresh memory corresponding to at least one character code of a character pattern to be enlarged. Enlargement control can be performed for each character, and for enlargement control of a certain character pattern, the corresponding character code is output from the refresh memory. Since it is possible to designate whether or not to enlarge by outputting the data via the control information and determining this control information, this can be done more easily than in the prior art by effectively using the refresh memory and its additional circuits. Enlargement instructions can be controlled.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional raster scan type character display device, FIG. 2 is a block diagram of an enlarged character display method showing an embodiment of the present invention, and FIG. 3 is a block diagram of a character display system to which the present invention is applied. FIG. 4 is a diagram showing the arrangement of characters and control characters in the refresh memory of the display device; FIG. 4 is a diagram showing enlarged character display commands; FIG. 5 is a screen display of the character data in FIG. 3; FIG. is the behavior of vertical and horizontal expansion, and the letter rH
FIG. 7 is a diagram showing an enlarged display of J. FIG. 7 is a diagram showing an address display of the character pattern "H" in the character generator. 1: Interface control unit, 2: Buffer memory (
3: Character generator (character generation section), 4: Cathode ray tube (CRT), 5: Cursor control section, 6: Synchronization signal generation circuit, 7: Video signal amplification circuit, 8: Horizontal deflection circuit, 9: Vertical deflection circuit, 10: Oscillation circuit, 11: Dot counter, 12: Raster counter, 13 Near address switch, 14: Processing device, 15:
Refresh memory, 16: memory read register,
1γ: Character generator, 18: Vertical magnification register, 19: Vertical magnification counter, 20: Raster address counter, 21: Raster switch, 22: Vertical expansion flip-flop, 23: Horizontal magnification register, 24: Horizontal magnification Counter, 25: Dot address counter,
26: dot switch, 2γ: horizontal expansion flip-flop, 28 two-dot selection circuit, 29: dot read register, 30: CRT, 31: refresh address, 3
2: Data bit of refresh memory, 33: Character code, 34 to 3γ: Control character (no magnification, horizontal magnification, vertical magnification, horizontal/vertical magnification), 38: Data in refresh memory, 39 :Display screen, 40
: Character pattern rHJ.

Claims (1)

[Claims] 1. A memory that stores at least a plurality of character codes to be displayed, a character generator that generates character patterns corresponding to the character codes output from the memory, and a character generator that displays the character patterns output from the character generator. In a display device having a display section, a first means for specifying a vertical magnification of a character pattern, a second means for specifying a horizontal magnification of a character pattern, and at least one character code to be magnified. the memory that stores control information including a control bit that specifies whether or not to expand by one in the vertical and horizontal directions;
When the character code is output from the memory, the control bit of the control information output from the memory is determined, and the result is 1, so that the information from the first means or the second means is valid. the character generator outputs the character pattern corresponding to the character code 1, and determines the enlarged character pattern according to the information 1 from the first means or the second means. A method for displaying enlarged characters, characterized in that one character is configured to apply a voltage.