JPS6024475B2 - Display device cursor display method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cursor display on a display device such as a CRT display device.

In general, a CRT display device receives character information from a computer or input device and displays the characters corresponding to that information, and also displays the character position on the display screen to indicate the character input position or character extraction position. A cursor mark is displayed below.

By the way, in conventional display devices, the cursor mark is only displayed at a fixed position and at a fixed size (length), so when changing the size of the displayed characters, the cursor mark is displayed at a fixed position. The image was displayed on the display screen in a form larger than the characters or smaller than the displayed characters, giving a sense of strangeness to the person monitoring the display screen and causing the viewer to look at the screen.

In addition, the characters to be displayed are divided by 4 and the displayed character position is
Even if you change the character appropriately within the specified character display range, the distance between the character position and the cursor mark position changes, which makes the old person who monitors the display screen feel strange, and causes him to shift his view. It was something.

The cursor display method of the present invention provides a display method that solves the above-mentioned problems. The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a control configuration of the display method of the present invention, and FIGS. 2a and 2b are diagrams showing display examples thereof.

To explain the control configuration in FIG. 1, 1 is a display data memory consisting of a RAM etc. that stores character code information transferred from a computer or an input device such as a keyboard, and has a storage capacity equivalent to the display screen. Data is also stored in a position corresponding to the display position, and control code information (control data) regarding the character is also stored here along with the character code.

This control data includes a code that indicates the size of the character (large, small), and a cursor display position code that indicates where the cursor should be displayed in accordance with the size of the character, that is, the distance between the character and the cursor. ing. The data memory 1 has an X-axis address counter 2 in the column direction.
The data to be displayed is displayed by addressing the Y-axis address counter 3 in the row direction.

4 is a character generator to which character code information of the data extracted from the data memory 1 is supplied;
A character pattern corresponding to input character code information is selected and the pattern information is derived.

Reference numeral 5 denotes a line address counter that counts up every line scanned on the CRT screen and increments the Y-axis address counter 3 by 1 when a predetermined value is counted. Each time a scan is performed, a count is performed, and when a predetermined number of times of scanning is performed, the Y-axis address counter 3 is incremented by 1 and the counter 3 is controlled to display the next line of characters on the screen. .

Therefore, the bit line in the selected character pattern of the character generator 4 is further selected in accordance with the count information of the line address counter 5, and each bit signal of the bit line is introduced into the shift register 6 in parallel. .

A dot clock signal DC synchronized with the scanning on the screen is supplied to the shift register 6, and the bit signals of the shift register 6 are sequentially and serially taken out in synchronization with the dot clock signal DC and sent to the CRT device 7 via an OR gate. The image is supplied to the camera and displayed. Therefore, outside of each character data in the data memory 1, the address counters 2 and 3 of the x scales and Y koji, the character generator 4, the line address counter 5, the shift register 6, and the dot clock signal DC.
The image is displayed on the screen of the CRT device 7 by the operation of .

On the other hand, 8 is a register that holds cursor display position information indicating at which character display position on the display screen a cursor mark is to be displayed, and this cursor display position information is coupled to the coincidence detection circuit 9. The coincidence detection circuit 9 receives address information from the X-axis address counter 2 and address information from the Y-axis address counter 3, and detects a coincidence (synchronization) between the cursor display position information and the x and Y address information. When this is achieved, a synchronizing signal (a daily level signal) is applied to one input terminal of the AND gate AND.
10 and 11 are multiplexers to which control data of the data retrieved from the data memory 1 is supplied. It compares the line information from the counter 5 and when they match (synchronize), a synchronization signal (day level signal) is applied to the other input terminal of the AND gate AND.

Therefore, the conditions for opening the AND gate AND are the cursor display position information of register 5 and the character scanning position (X, Y) of the display screen.
(information from address counters 2 and 3) match, and the scanning line in the character display area (information from line address counter 5) and control data cursor position information (position information indicating the spacing between characters) match. The flip-flop 12 is set by the coincidence signal (day level signal) from the AND gate AND. The flip-flop 12 supplies a set output to the CTR device 7 via the OR 0 gate, and the AND gate AND
The cursor mark will be displayed on the display screen from the moment synchronization is achieved. Further, the multiplexer 11 is supplied with code information indicating the size (large, small) of the character of the control data, that is, the length of the character in the line direction, and the above-mentioned dot clock signal DC is supplied to the AND gate A.
Counting information is supplied from a dot timing counter 13 that repeats counting operations sequentially from the time when synchronization is achieved with ND.

Therefore, when the information representing the length of the character in the line direction matches the count value of the dot timing counter 13, the multiplexer 11 outputs a match signal to reset the flip-flop 12 and stop displaying the cursor mark.

The coincidence signal of the multiplexer 11 is also supplied to the shift register 6 and serves to introduce the next bit line signal into the shift register 6. In other words, it is a load signal for the shift register 6. Therefore, the above-mentioned coincidence detection circuit 9 functions to synchronize the cursor mark with the character to be displayed based on the information from the register 8, and the multiplexer 10 determines the position or position of the cursor mark corresponding to the displayed character based on the control data. The multiplexer 11 has the function of determining at which position below the displayed characters the cursor mark is to be displayed, and further has the function of determining the length of the cursor mark to be displayed based on the control data.

From this, when the data stored in the data memory 1 is expressed by the x-axis and Y-axis address counters 2 and 3 in synchronization with the scanning of the display screen, the character code information is provided to the character generator 4 and integrated. The control data is supplied to multiplexers 10 and 11 while the corresponding character pattern is selected. When the information for displaying the cursor on the data currently retrieved from the data memory 1 is set in the register 8, the coincidence detection circuit 9 detects a coincidence and outputs a synchronization signal, and the line address 3 When the scanning line information from the scanter 5 matches the cursor mark display line position of the character display area (position 2 lines below the normal display character baseline), a synchronization signal is output from the multiplexer 10 and the AND gate AND is opened. 4 flip-flop 10 is set to reveal the cursor mark display.

Further, when the AND gate AND is opened, the dot timing counter 13 starts counting the dot clock signal DC, and the multiplexer 11 outputs the count value of the dot timing counter 13 and information indicating the character size of the control data (this information The flip-flop 10 is reset by detecting a match (which determines the length of the cursor mark, and is information indicating the length that matches the character width of the displayed character). Stop display.

By controlling the display of the cursor mark in this way, the cursor mark can be displayed as shown in Figure 2. In other words, in Figure 2a, the sizes of the displayed characters are different but the baseline of the displayed characters is the same, so the cursor mark is The mark KM is displayed on the same line by the multiplexer 10, and the multiplexer 1 to 1 displays a cursor size KM having the same length as the bottom of the character, depending on the size of the displayed character.

Furthermore, FIG. 2b is an example in which the letter "A" and the kanji "mountain" are displayed in different sizes and display positions. The length of the cursor mark KM is also defined by the multiplexer 11 to be the same length as the character width. In this way, in the cursor display of the present invention, control information including a character code, a code indicating the size of the character, and a cursor display position code indicating the spacing between the character and the cursor in relation to the character size is stored. said data memory, address means for sequentially accessing said data memory in synchronization with scanning of a display screen, storage means for storing cursor display position information, cursor display position information of said storage means and information of said address means. A coincidence detection circuit detects a coincidence with the cursor display position and code among the control information read from the data memory, and compares the input cursor display & false with the line address information of the address means. and means for inputting a code indicating the size of characters among the control information retrieved from the data memory to define the length of the cursor mark, Since the cursor mark is displayed in synchronization with the matching signal of the comparison means and the display length of the cursor mark is controlled by the regulation means, even if the displayed character position is changed as appropriate within the character display range, ,
The display interval between the character position and the cursor mark position can be made constant, and at the same time, the cursor display length can be set to match the character size, so when the displayed character position changes, unlike the conventional It is possible to avoid the inconvenience that the interval between the baseline of the cursor mark and the display line of the cursor mark fluctuates, and it is possible to obtain a display that is very easy to see without giving a sense of strangeness to the person monitoring the display screen.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a control configuration for cursor display according to the present invention, and FIGS. 2a and 2b are diagrams showing examples of the display. 1: Data memory, 2: X-axis address counter, 3: Y
Axis address counter, 4: Character generator, 5
: Line address counter, 6: Shift register, 7:
CRT device, 8: Cursor position information register, 9: Coincidence detection circuit, 10 and 11: Multiplexer, 12: Flip-flop, 13: Dot timing counter, AN
D: And gate. Figure 2 Figure 1

Claims (1)

[Claims] 1. A display device consisting of a data memory for storing display data, a character generator, a memory means for retaining cursor display position information, a display means for displaying a character pattern from the character generator and a cursor, and a control circuit for these. The data memory stores control information including a character code, a code indicating the size of the character related to the character, and a cursor display position code indicating the spacing between the character and the cursor in relation to the size of the character, and the display screen. addressing means for sequentially accessing the data memory in synchronization with the scanning of the data memory; storage means for storing cursor display position information; and coincidence detection for detecting a match between the cursor display position information of the storage means and the information of the address means. A cursor display position code is input from among the control information read out from the circuit and the data memory,
a comparison means for comparing the input cursor display position with line address information of the address means; and a code indicating a character size among the control information read from the data memory is input to determine the length of the cursor mark. A cursor mark is made in synchronization with the coincidence signal of the coincidence detection circuit and the coincidence signal of the comparison means, and the display length of the cursor mark is controlled by the regulation means. Display device cursor display method.