JPS6038743B2 - cursor control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cursor control device, and more specifically to a cursor control device for indicating a display position when inputting characters, numeric symbols, etc. (hereinafter collectively referred to as characters) in a display device. .

In a display device, when you want to change or delete a specific character or line of characters being displayed, display a series of characters from a specific position on the display screen, or when you want to output from a specific character to another specific character. etc., it is necessary to specify the address of a temporary storage device that has a capacity to store character data for one screen and that corresponds to a subdivision on the display screen.

In the display device, such designation is performed using a cursor that can be moved and set arbitrarily according to the counter output of a specific counter. The cursor is displayed on the display screen to indicate to the operator where on the display screen a display character given by a keyboard or from a data processing device or the like is to be displayed.
The cursor is generally displayed as an underline (1) between lines, and is automatically moved to the next character display position when a sentence or three is displayed at that position. There is also a method of blinking one section without relying on this underline. However, according to this method of blinking the sections, the pattern is the same as that of programmatic blink reversal, and it is difficult to distinguish between them.

Therefore, it is difficult for the operator to see and identify, which can lead to erroneous operations. The present invention has been made in view of the above-mentioned drawbacks, and it is possible to distinguish the display of the cursor (between the cursor and other displays) by adding a slight deviation in a display device that displays the cursor by blinking a section of the display. It is an object of the present invention to provide a cursor control device that is capable of Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a schematic block diagram of a display device using the present invention.

In the figure, 1 is an interface unit that receives display data from a computer and a keyboard (not shown), and -2 is a fresh memory that stores display data obtained from the interface unit 1. In addition to display character data,
Reversal instruction bit (normally data is displayed in green on a black background, but this is reversed and data is displayed in black on a green background)
, plink bit (blinks display data), etc. CRT
Contains control information for processing display data. Further, 3 is a pattern generator for converting data read from the refresh memory 2 into a display pattern such as characters, 4 is a serial converter for converting the display pattern obtained from the pattern generator 3,
It is also a video control section that performs brightness modulation control including display processing (plink, inversion, cursor), and the cursor control device intended in the present invention is also included in this block. Further, 5 is a CRT for displaying the video signal from the video control section 4 on the screen, and 6 is a timing control circuit that controls the overall timing of the display device shown in FIG. FIG. 2 is a circuit diagram showing only the logic of the cursor control section, which is particularly relevant to the present invention, of the video control section 4 in FIG. 1.

In the figure, reference numeral 11 indicates a blink designation signal which is an output from a blink flip-flop (not shown; set by display processing data obtained from refresh memory) and a certain frequency signal (for example, 4Hz) from the timing control circuit 6.
), and the output of the NAND gate 11 is cleared by the AND gate 12 together with the character data from the refresh memory 2, and becomes one input of the exclusive OR circuit 13. On the other hand, the cursor instruction signal is logically ANDed with a certain frequency signal (for example, 4Hz) from the timing control circuit 6 in the AND gate 14, and the dialogue type output is subjected to an exclusive OR with a reversal designation (REVERCE) from the refresh memory. It is input to the circuit 15.

The output of this exclusive OR circuit 15 becomes the other input to the exclusive OR circuit 13, and the output of this exclusive OR circuit 13 becomes a video signal. The operation shown in FIG. 2 will be explained in detail below.

First, when displaying normal characters, use BLINK, REVE.
CHA because signals such as RSE and CURSOR are “0”
The RACTER signal passes through an AND gate 12 and an exclusive OR circuit 13 and directly becomes a video signal. When the next blink is specified, the BLINK signal becomes "1" and the video signal is cut at a 4Hz clock cycle. Therefore, the characters blink. Also, when there is an inversion specification, the output of the exclusive OR circuit 15 becomes "1", and the CHARACTER
The inverted signal becomes the video signal. Now, regarding the cursor display, the input of the exclusive OR circuit 15 becomes "1" at the cycle of the 4Hz signal when the CURSOR signal becomes "1".
Therefore, when there is no inversion specification, the output will also be “1” and the CH
The ARACTER signal is inverted to become a video signal.

Furthermore, when inversion is specified, the inversion is performed at the opposite cycle. Furthermore, a periodic effect opposite to that of the blink specified period is obtained. In this way, the cursor display is designed so that it does not have the same pattern in any case. As explained above, according to the present invention, in a display device that has a blinking and reversing function and instructs the cursor display by blinking one block, the cursor is blinked in the opposite direction to the blink period, and the inversion designation and exclusive logic are used. By inverting and displaying the video signal by calculating the sum, it is possible to clearly distinguish between the cursor display and other displays.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of a display device in which the present invention is used, and FIG. 2 is a circuit diagram showing only the main parts of the cursor control device in the present invention. 1...Interface unit, 2...Refresh memory, 3...Pattern generator, 4...
Video control unit, 5... CRT, 6... Timing control circuit, 11... Nadgate, 12
,14... ...and gate, 13, 15...
...Exclusive OR circuit. Figure 1 Figure 2

Claims (1)

[Claims] 1. In a display device that has a blinking and reversing function and instructs the cursor display by blinking one section, the video signal is inverted by reversing the blink period and blinking the cursor, and then performing an exclusive OR with the reversal instruction. A cursor control device characterized by displaying.