JPS5814711B2 - Light pen information input method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light pen device installed in a display device that displays image information.

In conventional devices of this type, the line width or shading of the locus that displays the locus pattern drawn by the indicated position information indicated by the light pen from both sides of the display of the image display device is always constant.

In addition, in order to change this, a control input device separate from the light pen was installed to control the line width or shading of the locus on the display screen, so input on the display screen as described above was required. The disadvantage is that the operation becomes very complicated, or that such operation is not possible at all.

In order to eliminate these drawbacks, the present invention enables the line width or shading of a trajectory on a display screen to be controlled simply by inputting a light pen, and will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention,
In the figure, 1 is a Rusk scanning image display device attached to the light pen, 2 is a monitor image display device, 3 is a light pen that has a function of detecting pen pressure with a piezoelectric transducer, 4 is a pen pressure signal amplification circuit, and 5 is a light pen signal amplification circuit, 6 is a pen pressure signal A/D converter, and 7 is a light pen signal horizontal position A/D.
Converter, 8, light pen signal vertical position A/D converter, 9
10 is a horizontal position writing circuit, 10 is a vertical position writing circuit, 11 is a pen pressure signal writing circuit, 12 is a digital graphic memory, 13 is a horizontal position reading circuit, 14 is a vertical position reading circuit, 15 is a pen pressure signal reading circuit circuit, 16 is horizontal position D/A
17 is a vertical position D/A converter, 18 is a pen pressure signal D/A converter, 19 is a television signal synthesis circuit, and 20 is a synchronization signal generation circuit.

As shown in FIG. 5, the light pen 3 includes a pen body 1-1,
A pen tip body 3-2, a photoelectric conversion element 3-3 fixed in the pen tip body 3-2, a pen body 3-1, and a pen tip body 3-2.
and a voltage conversion element 3-4 installed between the
The photoelectric conversion element 3-3 converts the optical signal passing through the light transmission window 3-5 provided in the pen tip body 3-2 into an electric signal, and the piezoelectric conversion element 3-4 converts it into an electric signal. It converts changes in applied pressure into electrical signals.

FIG. 2 is an operational waveform diagram of the main parts of FIG. 1.

Next, the operation of the system of the present invention having the above configuration will be explained.
First, an input operation is performed using the light pen 3 from the rask scanning type image display device 1.

In this case, the operator holds the pen body 3-1 and draws a trajectory by bringing the tip of the pen tip body 3-2 into contact with the display screen of the rask scanning image display device 1.

At this time, the light beam of the display device 1 that has passed through the light transmission window 3-5 is converted into an electrical signal by the photoelectric conversion element 3-3, and a light pen pulse group a is obtained as an output.

This is added to the light pen signal amplification circuit 5 to obtain the light pen signal b.

At the same time, a change in pen pressure applied to the pen tip body 3-2 of the light pen 3 is detected by the voltage conversion element 3-4, and a pen pressure signal C
is obtained from the pen pressure signal amplification circuit 4.

It is assumed that the pen pressure signal C in this case is changed in steps for the purpose of explaining the operation.

Next, convert light pen signal b to light pen signal horizontal position A/
D converter 7 and light ben signal vertical position A. /D converter 8
In addition, the display of the rask scanning image display device 1 is calculated from the time difference between the horizontal and vertical synchronizing signals inputted from the synchronizing signal generation circuit 20 for each pulse of the light pen signal b using the following methods which are already widely known. The address position on the screen is detected and digitally encoded, and this is input to the horizontal position writing circuit 9 and the vertical position writing circuit 10.

The pen pressure signal C is applied to the pen pressure signal A/D converter 6 to be digitally encoded, and then applied to the pen pressure signal writing circuit 11.

Each writing circuit 9, 10, 11 writes the locus drawn by the light pen 3 and the pen pressure into the digital graphic memory 12.

Next, the horizontal position readout circuit 13, the vertical position readout circuit 14, and the pen pressure signal readout circuit 15 perform a repetitive readout operation from the digital graphic memory 12 in synchronization with the horizontal and vertical synchronization signals from the synchronization signal generation circuit 20.

Horizontal position D/A converter 16 and vertical position D/A converter 17
The pen pressure signal D/A converter 18 converts the read digital code into a continuous analog signal and inputs it to the television signal synthesis circuit 19.

The television signal synthesis circuit 19 generates a television signal d from the pen pressure signals detected at each point of the locus drawn by the light pen 3 on the display screen of the rask scanning image display device 1 and the address position read from the digital graphic memory 12. Synthesize.

The relationship is shown in FIG. FIG. 3 shows an example of a display in which the pen pressure signal is displayed as a shading of a locus drawn by the light pen 3, and the shading of the locus corresponds to the voltage output of the pen pressure signal.

Next, the television signal synthesis circuit 19 displays the television signal d as a rask scan image on the rask scan type image display device 1 and other monitor image display devices 2.

Similarly, as shown in the display example of FIG. 4, by adding to the television signal synthesis circuit 19 a function of converting changes in the pen pressure signal into changes in the line width of the scanning locus drawn by the light pen 3 and displaying the result. It is also possible to display.

With such a structure, a graphic input operation using a locus drawn by the light pen 3 having arbitrary changes in shading or line width can be input with a simple one-touch operation.

As explained above, according to the method of the present invention, it is possible to control the shading or line width of the locus drawn by the light pen on the display screen simply by inputting the light pen. This has the advantage of making it easy to perform input operations such as

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram of an embodiment of the present invention, FIG. 2 is an operation waveform diagram explaining the operation of the main parts of FIG. 1, and FIGS. 3 and 4 are tables of input results in FIG. 1. An explanatory diagram showing an example, FIG. 5 is a sectional view showing a specific structure of a light pen. DESCRIPTION OF SYMBOLS 1... Rusk scanning type image display device, 2... Monitor image display device, 3... Light pen, 4... Pen pressure signal amplification circuit, 5... Light pen signal amplification circuit, 6... Pen pressure signal A/ D converter, 7... Light pen signal horizontal position A/D converter, 8... Light pen signal vertical position A/D conversion 2K,
9...Horizontal position writing circuit, 10...Vertical position writing circuit,
11...Pen pressure signal writing circuit, 12...Digital graphic memo board, 13...Horizontal position reading circuit, 14...
Vertical position reading circuit, 15...Pen pressure signal reading circuit, 16
... Horizontal position D/A converter, 17 ... Vertical position D/A converter, 18 ... Pen pressure signal D/A converter, 19 ... Television signal synthesis circuit, 20 ... Synchronization signal generation circuit.

Claims (1)

[Claims] 1. An image display device to which a light pen is attached, which has the function of detecting pen pressure information and position information on the screen when the light pen is brought into contact with the display screen, and the information detected by the light pen is stored and updated at any time. a storage device configured to be readable from the image display device; the storage device stores information symbols representing indicated position information and pen pressure information of the light pen on the display screen of the image display device; Based on the information signal read out from the device, an image signal is supplied to the image display device or another image display device, and the trajectory pattern and pen pressure information of the light pen are displayed on the display screen depending on the density of the trajectory or the pen pressure information. A light pen information input method characterized by displaying an image expressed as a change in line width.