JPS6072018A - Light pen control device - Google Patents

Abstract

PURPOSE:To call an operator's attention, and also to detect easily a character by a light pen, by constituting so that a line width of only a character which can be detected by the light pen becomes thick. CONSTITUTION:A display item of a CRT character display device is selected by a light pen, and a serial video signal of a regular character width inputted to an input terminal 1 is delayed by a delay circuit 4. When a light pen switch signal of an input terminal 2 is off, an AND circuit 5 is closed, and this delay signal is not inputted to an OR circuit 6, a video signal of the input terminal 1 is outputted as it is, and becomes a video signal for displaying a regular character. When said switch signal is on, the delayed video signal is inputted to the OR circuit 6, brought to OR with the original video signal, a display time of the video signal becomes long, and a line width of a display character on a CRT display becomes thick.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light pen control system in a CRT character display device.

Conventionally, this type of light pen control method displays a sense line symbol superimposed on the letter m that can be detected by the light pen by pressing a switch built into the light pen, as shown in FIG. This not only indicates detectable characters to the person operating the light pen, but also facilitates the detection of characters by the light pen.

However, because the sense line is superimposed on the letters, the original shape of the letters is destroyed, making it difficult to read the letters correctly.
There was a drawback that it led to incorrect operation.

Therefore, the purpose of the present invention is to avoid changing the original type of characters, and
To provide a light pen control device that differentiates characters that can be detected by a light pen from characters that cannot be detected, calls attention to an operator, and facilitates the detection of characters by a light pen.

According to the present invention, in a method of selecting display items of a CRT character display device using a light pen, it is possible to increase the line width of characters detectable with the light pen by %a.
A light pen control device r is obtained.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the drawings which show one embodiment of the present invention.

Referring to FIG. 2, a serial video signal having a normal character width input to an input terminal 1 is delayed by a delay circuit 4. When the light pen switch signal of input terminal 2 is off, AND circuit 5 is closed, and the delayed video signal is ORed.
It is not input to circuit 6. Therefore, the video signal from the input terminal 1 is outputted to the output terminal 3 as it is, and becomes a video signal for displaying normal characters.

When the switch signal is on, the delayed bidet No. 1d is input to the OR circuit 6, and is ORed with the original bidet i signal.
As shown in the figure, the display time of bidet No. 1S becomes longer, and as a result, as shown in FIG. 4, the line width of the displayed characters on the CRT display becomes thicker.

In this way, the characters that can be detected by the light ben are displayed by changing the line width of the characters rather than by using the sense line, so that the shapes of the characters are not distorted.

As explained above, the present invention has the effect of increasing the line width of only the characters that can be detected with a light ben, thereby not only calling the operator's attention without destroying the original shape of the character, but also making it easier to detect characters with the light ben. .

[Brief explanation of the drawing]

FIG. 1 shows an example of a conventional display. FIG. 1(a) shows when the light bend switch is off, FIG. 1(b) shows it when it is on, and FIG. 2 shows the display of the present invention. A block diagram showing an embodiment of the present invention, FIG. 3 is a timing diagram of an embodiment of the present invention, and FIG. 4 is a display example of an embodiment of the present invention.
When the light switch is off, Figure 4(b) &j1.
FIG. 6 is a diagram showing when the light pen switch is on. 1...Video input signal, 2...Switch signal, 3...Video output signal, 4...
・Delay circuit, 5...AND circuit, 6...
・OR circuit. Figure 2 H j Figure 4 (b,) ABCD IFGHI

Claims (1)

[Claims] A light-bent rAl device that reads and scans display items on the surface of a CRT character display device using a light pen, characterized in that the line width of characters that can be detected by the light pen is displayed in a thicker line width.