JPS58222332A - Image display device - Google Patents

Abstract

PURPOSE:To extend the function of a television blackboard, by displaying synthesizingly the storage content of a still picture storage means and a picture memory, in an image display device for pattern display in response to a data of the picture memory. CONSTITUTION:In using the titled display as the television blackboard, a data written in the picture memory 21 is displayed according to a light pen 27 when a prescribed signal is fed to a microprocessor 12 to open a switch 9 and to close a switch 26. When the prescribed signal SPD is fed during the reception of a television broadcast, the picture for the case is written in a still picture memory 4 and displayed on an image display section 11. Further, the switch 26 is closed by feeding the prescribed signal to the microprocessor 12, the display image of the data written in the still picture memory 4 is traced with the light pen 27, the data corresponding to the locus is written in the picture memory 21 and the profile is displayed synthesizingly on the image display section 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an image display device that displays a pattern according to data looked into an image memory, and moreover, when a light pen is placed opposite to the screen of an image display unit such as a CRT, This relates to a video display device that is capable of writing data (color display information, etc.) to be displayed at the opposite position, that is, the designated position, to an address in the image memory allocated to correspond to the designated position.0 The above-mentioned video By moving the light pen's indicated position, the display device writes color display information one after another at addresses in the image memory that correspond to the movement trajectory, and displays on the CRT according to this glance. Therefore, CRT
This system can be called a TV blackboard system, which uses a light pen as a blackboard and a light pen as chalk. By the way, although such a system allows you to draw freely on a CRT, it is difficult to do so unless you have a certain level of drawing talent. It was difficult to draw pictures on it, and as a result, its functions were not fully utilized or its uses were not expanded.

The present invention has been made in view of the above circumstances, and allows each station to display a model image on a CRT and trace it with a light pen to view the image memory. DESCRIPTION OF THE PREFERRED EMBODIMENTS An object of the present invention is to provide a video display device that enables skillful drawing.The present invention will be specifically described below with reference to drawings showing embodiments thereof. In Fig. 1, the radio wave captured by antenna 1 becomes an intermediate frequency signal by Yuna 2 and becomes switch 3.
, 5, a video amplification circuit, a television circuit 6 including a color signal circuit, etc., and then predetermined signal processing is performed, and then a switch 7.
9. Video display section 1 consisting of CRT etc. via mixing circuit 10
1, so that normal television broadcasting can be received.

When the interlocking switches 3 and 5 are switched, the output of the tuner 2 is sent via the switch 3 to the still picture memory 4 using digital memory, and the data stored in the still picture memory 4 and read out from there is sent to the switch. 5 to the television circuit 6. The switch 7 is a switch that operates in conjunction with the switches 3 and 5, and when the switch 1/3.5 is switched to the still image memory 4 side, the output of the television circuit 6 is sent to the attenuator 8 and the microprocessor 12. a mixing circuit 10 via a switch 9 controlled by
012 is a microprocessor which serves as the control center of the device of the present invention, and when the still image display instruction signal SPD is applied, the switch 3, 5.7 is switched to the still image memory 4 side and the attenuator. 8 side, and the still image memory 4 has a storage capacity of one frame of still images.
The image for one frame is stored and then read out later.

In order to perform such control by the microprocessor 12, the vertical synchronizing signal vS1 of the tuner 2 output and the horizontal synchronizing signal H8 are used O13\i Still image memory 4
This counter is used to create write addresses and read addresses, and performs counting according to signals given from the microprocessor 12 based on the vertical synchronizing signal vS and horizontal synchronizing signal H3, and uses the counted value as an address to write to the still image memory 4.
The microprocessor 12 also outputs a write/read instruction signal W/R to the still image memory 4 to instruct whether to write or read.
When receiving the still image display instruction signal SPD, it outputs the video signal for one frame starting from the vertical synchronization signal vS of the next...
The write/read instruction signal W/R is used as the content of the write instruction, and a pulse for updating the address is output to the counter 13, which is written to the still image memory 4 via the switch 3, and then the write/read instruction is issued. The above-mentioned convolution contents are displayed on the video display unit 11 through the attenuator 8 and the mixing circuit 10 using the signal W/R as the content of the read instruction. In this case, since the light passes through the attenuator 8, the brightness is lower than in the case of normal television broadcast reception.Next, the part that functions as a television blackboard will be explained. This is an image memory using 21 digital memories, and the pixels of the video display section 11 are associated with their addresses, which is similar to the still image memory 4. The pulses associated with the vertical synchronization signal vS and the horizontal synchronization signal H5 are output to the read address generation circuit 22 and the write address generation circuit 24. The outputs of the 0 read address generation circuit 22 and the write address generation circuit 24 are selectively applied to the image memory 21 under the control of the multiplexer 23. The microprocessor 12 outputs a write/read instruction signal W/R' to the image memory 21 and the multiplexer 23, and when this signal W/R' instructs writing, the image memory 21 is placed in the write mode. and the multiplexer 23 is connected to the write address generation circuit 24.
Conversely, when instructing readout, Vcti, the image memory is in readout mode, and multiplexer 23 selects the output of readout address generation circuit 22. Note that the signal W/R' serves as a write instruction only once per frame during the non-display period to prevent flickering of the displayed image. Read address generation circuit 2
Similarly to the counter 13, the count value of the counter 2 is updated, and it is also possible to use both. On the other hand, the write address generation circuit 24 generates the address of the image memory 21 corresponding to the position indicated by the light pen 27 based on the input from the light pen 27, which itself is a known circuit. The microprocessor 12 supplies display-related information, such as color information, to the image memory 21 as write data WDT, and as described above, the signal W
While /R' is instructing writing, the write data WDT is written in the area of the image memory 21 designated by the address output by the write address generation circuit 24.

Therefore, when the light pen 27 is moved along the raster of the video display section 11, writing will be performed accordingly. In periods other than such writing, data is read from the image memo IJ 21 by the output of the read address generation circuit 22, but this successive data is transferred to the D/A (
The switch 26 is converted into an analog video signal by the digital/analog conversion circuit 25 and is controlled by the microprocessor 12. The signal is applied to the video display unit 11 via the mixing circuit 10, and thereby the data in the image memory 21 is displayed on the video display unit 11. Since the mixing circuit 10 is provided, the signal from the television circuit 6 side and the signal from the image memory 21 side are mixed, and the video display section displays images y'zi, a! related to each signal. E*'a
h 9 j l K fx Z o""The device W of the present invention configured as described above gives a predetermined signal to the microprocessor 12 during normal television broadcast reception, and from this, a predetermined signal is emitted, and then the switch 3, 5.7 is switched to bypass the still image memory 4 and the attenuator 8, and the switch 9 is closed and the switch 26 is opened. As a result, the video related to reception by the antenna 1 is displayed on the video display section 11.

On the other hand, when used as a television blackboard similar to the conventional one, a predetermined signal is given to the microprocessor 12, which causes it to emit a predetermined signal to open the switch 9 and close the switch 26. As a result, the content of the data written in the image memory 21 is displayed on the video display section 11 according to the movement trajectory of the indicated position of the light pen 27.

Now, when the above-mentioned signal SPD is applied while receiving a television broadcast, the image at that time is written to the still image memory 4 via the switch 3, and this content is written to the still image memory 4 via the switch 3. After passing through the attenuator 8, etc., the screen is displayed on the video display section 11 as shown in FIG. 2(a).
1 is shown.

When a predetermined signal is applied to the microprocessor 12 to close the switch 26, the light pen 27 becomes ready for drawing.

When the operator traces the outline of the displayed image related to the data written in the still image memory 4 with the light pen 27, data corresponding to the trajectory is written in the image memory 21, and accordingly, the image display unit 11 The contour lines are displayed in a composite manner as shown in FIG. 2(b). In this case, the image stored in the still image memory 4 is displayed via the attenuator 8, so that the outline drawn by the light pen 27 is clearly displayed.

After finishing the required drawing with the light pen 27, m
A predetermined signal is given to the microprocessor 12 to open the switch 9. Then, as shown in FIG. 2(c), only the image written in the trap image memory 21 will be displayed, and you can easily draw a skillful picture using the image stored in the still image memory 4 as a model. become.

In the above-mentioned embodiment, the video to be stored in the still image memory 4 is that of a television broadcast, but it may also be one shot with a television camera, recorded with a video tape recorder, recorded on a video disc, etc. But of course it's a good thing. Further, the still image memory 4 is not limited to the above-mentioned digital memory, but may also be other recording means such as a magnetic disk or a magnetic drum, and the same effect may be achieved by using a still image reproducing function of a video tape recorder or a video disk. good.

As described above, the video display device according to the present invention includes still image storage means for storing video signals, an image memory associated with the video display section, and a still image memory corresponding to a position on the video display section indicated by a light pen. It is equipped with means for writing data for video display into an area of the image memory, and is configured so that the stored contents of both the still image storage means and the image memory are displayed in a composite manner on the video display section. It has the advantage of expanding functionality, expanding uses, and doubling the fun of drawing.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 (
a), (b), and (c) are diagrams illustrating its operation. 4...Still image memory 10...Mixing circuit 11...
・Video display unit 12...Microprocessor 21・
...Image memory 27...Light pen patent applicant Noboru Kawano, patent attorney and agent for Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. Still image storage means for storing video signals, an image memory associated with the video display section, and an area of the image memory corresponding to the position on the video display section indicated by the light pen for displaying the video. A video display device 0 characterized in that the video display device 0 is characterized in that the video display device 0 is equipped with a means for pledging data, and is configured so that the stored contents of both the still image storage device and the image memory are displayed in a composite manner on a video display section.