JPH04232992A - Display device for ohp projector with input/output function - Google Patents

Abstract

PURPOSE:To input additional information to the information on the image which is displayed by the display device for an OHP projector and is inputted by a personal computer. CONSTITUTION:The personal computer is connected to the display device for the OHP projector and the signals from other external devices are connected by using an RS 485 interface for the display device for the OHP projector. Bidirectional memories are disposed in both of the display device for the OHP projector and the external device and the image information from the personal computer is written into the respective bidirectional memories. The signals from a digitizer as the external device are added to the written image information or is corrected and written into the bidirectional memory of the external device. This information is transferred to the bidirectional memory of the display device for the OHP projector and is displayed.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to the synthesis of input and output signals from external devices such as digitizers and keyboards regarding images and other information displayed or stored on a display device for an OHP projector. , and OH with a function that allows changes.
This invention relates to a display device for a P projector.

0002

[Prior Art] A conventional display device for an OHP projector has only the function of inputting a video signal from an information processing device such as a personal computer or OA device and displaying the image, and has the function of simply inputting a video signal from an information processing device such as a personal computer or OA device and displaying the image. It did not have an input/output function for images and other information related to the images. Further, if processing is required for the image displayed on the OHP projector display device, the information processing equipment needs to have a processing function.

0003

[Problem to be Solved by the Invention] According to the above-mentioned conventional technology, when an image displayed on an OHP projector display device is processed on the information equipment side, it depends on existing hardware and software functions. This has the disadvantage of being subject to restrictions when processing.

0004

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and is an OHP projection system that inputs a video signal output from an information processing device and displays the video signal as an image. The present invention proposes an OHP projector display device with an input/output function, which has a mechanism for controlling information input from the information processing device and information from an external device in the OHP projector display device. It is something.

[0005]

[Operation] The present invention does not require adding any new processing functions to the information processing equipment side, and can interface with the OHP projector display device.
It is possible to input, output, and change images from information processing equipment and information from other OA equipment by adding information from external devices via the interface.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. Personal computer 3 as information processing equipment is OHP
A digitizer 2 with a liquid crystal display as an external device is connected to the display device 1 for an OHP projector through an RS485 interface cable 23. Furthermore, the second and subsequent digitizers (not shown) are successively connected in series by an interface cable 24.

The OHP projector display device 1 includes a CPU 6
A bidirectional memory 5, a work memory 9, a ROM 8 containing a program for controlling an OHP projector display device, and a remote control receiver 10 are connected to the CPU 6. The bidirectional memory 5 is further connected to a liquid crystal controller 4, and the liquid crystal controller 4 is connected to the personal computer 3 and also to the liquid crystal 7. Remote control receiver 9
is connected to an optical remote control 11 by optical communication. C.P.
U6 further includes, via the RS485 interface 12,
Connected to external equipment.

The digitizer 2 with a liquid crystal display as an external device is connected to the RS485 interface 12 of the OHP projector display device 1 through an RS485 interface 13 via a cable 23. The RS485 interface 13 is connected to a CPU 14, which is connected to a bidirectional memory 15, a ROM 16 containing a program for controlling the digitizer 2 with a liquid crystal display, a work memory 17, and a digitizer controller 18. The bidirectional memory 15 is further connected to a liquid crystal controller 19, and the liquid crystal 2
Connected to 0.

The digitizer controller 18 is connected to a digitizer electrode 21 and a position detection input pen 22, and although the details are omitted, it applies a signal to the digitizer electrode 21 and detects this signal with the signal detection input pen 22. , which processes signals at designated positions on the digitizer of the signal detection input pen 22.

Next, the actual operation will be explained. OH
A video signal from a personal computer 3 is input to a liquid crystal controller 4 of a display device 1 for a P projector. This LCD controller 4
The input video signal from the personal computer 3 is first written into the bidirectional memory 5, which is a memory that can be read and written by the liquid crystal controller 4 and the CPU 6, and then the written data for one screen is read out. , the data is converted into data corresponding to the display on the liquid crystal 7 and displayed on the liquid crystal 7. The CPU 6 can receive data transmitted from the remote control 11 via the remote control receiver 10. In addition, CPU6 has RS485 interface 1
2 allows communication with the digitizer 2 with a liquid crystal display. The work memory 9 has a memory capacity equal to or greater than that of the bidirectional memory 5.

In the digitizer 2 with a liquid crystal display, a digitizer controller 18 drives a digitizer electrode 21 and inputs a signal from a position detection pen 22. The liquid crystal controller 19 and the CPU 1
The data for one screen written in the bidirectional memory 15 as a readable/writable memory is read out and displayed on the LCD 20.
The data is converted into data compatible with the display and displayed. The CPU 14 sends the image data sent from the OHP projector display device 1 to the RS485 interface 13.
can be received and written into the bidirectional memory 15. Further, the CPU 14 can transmit position data obtained from the digitizer controller 18 to the OHP projector display device 1 via the RS485 interface 13, and convert this position data into image data and store it in the bidirectional memory 15. Can be written. The work memory 17 has a memory capacity equal to or greater than that of the bidirectional memory 15. Note that the ROM 8 of the OHP projector display device 1 and the ROM 16 of the digitizer contain a program for controlling communication on the RS485 interface.

Next, the processing procedure of the present invention will be explained. When you operate the remote control 11 or set the digitizer to command mode and display the screen of the computer 3,
A video signal from a personal computer 3 is taken into a bidirectional memory 5 as image data, and the image is displayed on a liquid crystal 7. When the digitizer is set to the image reception mode, the image data in the bidirectional memory 5 in the OHP projector display device 1 is loaded into the bidirectional memory 15 in the digitizer, and the image is displayed on the liquid crystal 20. Set the digitizer to drawing mode and use the input pen 22.
When a figure is drawn on the digitizer using the digitizer, the figure is displayed on the liquid crystal 20, the figure data is written into the bidirectional memory 5 in the OHP projector display device 1, and the image is displayed on the liquid crystal 7.

[0013]

[Effects of the Invention] Since the present invention has an interface function with the outside, it is possible to read and write images and other information in the display device for an OHP projector from the outside, without adding any hardware or software to the information processing equipment. It's over. In the above embodiment, a digitizer with a liquid crystal display is connected as an input/output device to a display device for an OHP projector, but by providing an interface converter in addition, a mouse can be used as an input device, a printer can be used as an output device, and a printer can be used as an input/output device. It is also possible to connect other information processing equipment. In particular, when multiple digitizers with liquid crystal displays are connected, it is considered to be effective for conferences and educational purposes.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram in an embodiment of the present invention.

[Explanation of symbols]

1 Display device for OHP projector 2 Digitizer with LCD display 3 PC 4.LCD controller 5 Bidirectional memory 7.LCD 6 CPU 9 Work memory 10 Remote control receiver 11 Remote control 12 RS4852 interface 13 RS4852 interface 14 CPU 15 Bidirectional memory 16 Work memory 18 Digitizer controller 19 LCD controller 20 LCD 21 Digitizer electrode 22 Input pen for position detection

Claims (1)

[Claims] Claim 1: A display device for an OHP projector that receives a video signal output from an information processing device and displays the video signal as an image, wherein the display device for an OHP projector receives information input from the information processing device. and a mechanism for controlling information from an external device.