JPS62151066A - Electronic blackboard device - Google Patents

Abstract

PURPOSE:To effectively operate a conference displaying plural picture data simultaneously on plural video display devices and performing a comparative analysis and a related explanation on a picture data by providing video memory circuits for plural number of pictures and plural number of video output circuits. CONSTITUTION:The picture data inputted to an input plane 11 with a pen, etc., is detected with an input detection circuit 12, and is recorded on one circuit selected out of video memory circuits 14a, 14b, and 14c with an input selection circuit 13. The input selection circuit 13 selects the video memory circuit to be recorded out of the circuits 14a, 14b, and 14c with an input selection circuit control signal 19 from a control circuit 23. Each of output selection circuits 15a, 15b, and 15c selects one of the video memory circuits 14a, 14b, and 14c with an output selection circuit control signal 21 from the control circuit 23, and reads out the picture data, and displays it on each of video display devices 17a, 17b, and 17c through each of video output circuits 16a, 16b, and 16c. Each part receives a timing control from the control circuit 23 with control signals 18, 20, and 22.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electronic whiteboard device having a plurality of video memory circuits.

2. Description of the Related Art Conventionally, this type of electronic whiteboard device has been equipped with a video memory circuit for one screen, and drawing data has been stored in the video memory circuit and simultaneously read out and displayed on a video display device.

FIG. 2 shows the configuration of a conventional electronic whiteboard device. Second
In the figure, 1 is an input surface of an electronic whiteboard device, 2 is an input detection circuit, 3 is a video memory circuit, 4 is a video output circuit, and 5 is a video memory circuit.
is a video display device, 6 is a control circuit, and 7 is an external memory device.

In FIG. 2, drawing data inputted with a pen or the like onto the input surface 1 of the electronic whiteboard device is detected by the input detection circuit 2 and recorded in the video memory circuit 3. It is displayed on the display device 5. The drawing data is recorded in the external memory device 7 as necessary. Further, the drawing data read from the external memory device 7 is displayed on the video display device 5 from the video memory circuit 3 via the video output circuit 4. These controls include an input detection circuit control signal 8, a video memory circuit control signal 9, and a video output circuit control signal 10 from the control circuit 6.
It is carried out by

Problems to be Solved by the Invention However, in the conventional electronic whiteboard device having a video memory circuit for one screen, in order to compare and examine multiple screens, drawing data is read from an external storage device, and data stored in the electronic whiteboard device is read out. There has been a problem in that it cannot be displayed on a video display device without passing through a video memory circuit. 1 more
Since it has only one system of video output circuits corresponding to video memory circuits for screens, there is a problem in that it is not possible to simultaneously compare and examine the drawing data of a plurality of screens and explain the relationship with the previous screen.

The present invention solves these conventional problems,
The object of the present invention is to provide an excellent electronic blackboard device that can effectively present drawing data.

Means for Solving the Problems In order to achieve the above object, the present invention provides an electronic whiteboard device with video memory circuits for multiple screens and multiple video output circuits, and simultaneously transmits multiple drawing data to multiple video display devices. It is made so that it can be displayed.

Effects The present invention has the following effects due to the above configuration. That is, each independent video output circuit is separately connected to a plurality of video memory circuits by a corresponding control signal, so that different drawing data can be displayed simultaneously on a plurality of video display devices.

Example FIG. 1 shows the configuration of an embodiment of the present invention.

In FIG. 1, 11 is an input surface of the electronic whiteboard device,
It is connected to the input detection circuit 12. 13 is an input selection circuit, which is connected to the input detection circuit 12. 14a
, 14b, and 14C are independent video memory circuits, and are connected to the input selection circuit 13. 15
a, 15b, and 15C are independent output selection circuits, each of which is a video memory circuit 14a.

14b and 14C. 16a, 1
6b, 16C are independent video output circuits, and are connected to output selection circuits 15a, 15b, 15C, respectively.

17a, 17b, 17C are independent video display devices, each connected to a video output circuit 16a.
, 16b.

Connected to 16C. 18 is an input detection circuit control signal, 19 is an input selection circuit control signal, 2o is a video memory circuit control signal, 21 is an output selection circuit control signal, and 22 is a video output circuit control signal, which is transmitted from the control circuit 23 to each part. Ru.

Next, the operation in the above configuration will be explained.

In FIG. 1, drawing data input with a pen or the like to the input surface 11 of the electronic whiteboard device is detected by the input detection circuit 12, and is detected by the input selection circuit 13 by the video memory circuit 14a.
, 14b, 14C is selected and recorded. The input selection circuit 13 selects the video memory circuits 14a, 14b1, 14C to be recorded in accordance with the input selection circuit control signal 19 from the control circuit 23. Each output selection circuit 15a, 15b, 15C selects one of the video memory circuits 14a, 14b, 14C by an output selection circuit control signal 21 from a control circuit 23.
One is selected and the drawing data is read out and displayed on the video display devices 17a, 17bl, 17C via the video output circuits 16a, 16b, 16C, respectively. Each section receives timing control from a control circuit 23 using an input detection circuit control signal 18, a video memory circuit control signal 20, and a video output circuit control signal 22.

Effects of the Invention As is clear from the above embodiments, the present invention has the following effects.

(1) Since different screen contents can be displayed simultaneously, it is possible to conduct effective meetings by comparing drawing materials and providing related explanations.

(2) No video distribution device is required when the same screen is displayed on multiple screens at the same time.

(3) Independent discussions can be held on screens other than the screen currently being input.

(4) A plurality of different video outputs can be simultaneously presented at different venues, and input instructions from the electronic whiteboard can be transmitted individually.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an electronic whiteboard device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional electronic whiteboard device. 11... Input surface, 12... Input detection circuit, 13...
Input selection circuit, 14a, 14b, 14C...
Video memory circuit, 15a, 15b, 15C-
・Output selection circuit, 15a, l61) +16C・
...Video output circuit, 17a, 17b, 17c
. . . video display device, 18 . . . input detection circuit control signal, 19 . . . input selection circuit control signal, 20.
...Video memory circuit control signal, 21...Output selection circuit control signal, 22...Video output circuit control signal, 23
...Control circuit. Name of agent: Patent attorney Toshi Nakao Haka1 person i1
figure

Claims (1)

[Claims] one input surface, a video memory circuit having a capacity for multiple screens of this input surface, a plurality of video output circuits for displaying independent drawing data, and selecting the video memory circuit and outputting the video. An electronic whiteboard device comprising: an output selection circuit connected to the circuit; and a plurality of video display devices respectively connected to the video output circuit.