JPH04269B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a display device that projects and displays input data on a screen, and particularly to a display device with improved operability.

[Prior art]

FIG. 1 shows a display device according to the prior art. Reference numeral 1 designates an overhead projector main body, and a top plate 2 on the top surface of the overhead projector main body 1 is made of a transparent material so that an object to be displayed A can be placed thereon, and a light source 3 directed upward is provided inside. is installed. Further, 4 is a screen, and a mirror 5 is disposed between the screen 4 and the overhead projector main body 1, and the mirror 5 projects the object A on the top plate 2 onto the screen 4. It is placed in a position where

Next, to explain its operation, when a transparent paper, which is the display object A on which input data is written, is placed on the top plate 2, the input data is reflected by the mirror 5 and then displayed on the screen 4. be done.

By the way, in the conventional display device configured as described above, in order to change the content displayed on the screen 4, new data must be written separately on a transparent sheet of paper, and this transparent sheet must be inserted into the screen that has already been set. It has to be replaced with a transparent paper, which is not only complicated and troublesome, but also has the disadvantage that the worker's face is likely to be directly exposed to the heat and light of the light source when replacing it.

[Summary of the invention]

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and is provided with a receiving unit section having a light transmitting surface, and furthermore, data to be displayed on the screen can be displayed on the receiving unit section by remote control. Not only can the display device be easily changed, but also the negative effects of heat and light from the light source can be removed.

[Embodiments of the Invention] Examples of the present invention will be described below with reference to FIGS. 2 to 5. 2 and 3 show a first embodiment. In FIG. 2, reference numeral 11 denotes a sketching section, and the sketching section 11 modulates and transmits a position signal corresponding to a pattern specified by a line pen P as a writing member. Reference numeral 12 denotes a receiving unit portion fixedly mounted on the top plate of the overhead projector main body 1. The receiving unit portion 12 receives the output signal from the sketching portion 11 and generates an image based on the output signal. The image is projected onto the screen 4 by the mirror 5.

FIG. 3 shows a specific circuit configuration of the sketch section 11 and the receiving unit section 12.

In the figure, 13 is an input terminal having a pattern input surface 14;
4, outputs a position signal corresponding to the pattern instructed by the light pen P as a light member, and samples and outputs an analog change value proportional to the handwriting position of the light pen P at an appropriate frequency. It's becoming like that. 15 is an A/D converter, 16 is a data processing section, and the data processing section 1
6 inputs the output signal of the A/D converter 15 and outputs a digital serial signal. Further, 17 is a transmitting section, and the transmitting section 17 is composed of a modulating section 18 that modulates the digital serial signal in accordance with a communication channel, and a transmitting antenna 19.

The input terminal 13, A/D converter 15, data processing section 16, and transmission section 17 constitute the sketching section 11.

Further, 20 is a receiving antenna, and 21 is a demodulating section, which receives and demodulates the output signal of the sketching section 11, and outputs a signal that complements the data between discrete data. . or,
22 is an LCD driving section; 23 is an LCD display section as a light transmitting surface driven by a drive signal output from the LCD driving section 22;
Images are displayed based on drive signals from the LCD drive section 22. Above receiving antenna 2
0, a demodulating section 21, and an LCD driving section 22 constitute a receiving section 24.

The display device according to the present invention is constructed as described above,
Next, its effect will be explained.

As shown in FIG. 3A, when a line figure is traced on the pattern input surface 14 with the light pen P,
samples the handwriting at an appropriate frequency and outputs an analog change value corresponding to the position of the light pen P. The analog change value is converted by the A/D converter 15, converted into serial data by the data processing section 16, and then transmitted from the transmitting antenna 19. The data transmitted from the transmitting antenna 19 is received by the receiving antenna 20, demodulated and complemented by the demodulator 21, and then displayed on the light transmitting surface 23. The image is similar to the line figure traced on the pattern input surface 14. The image thus displayed on the light transmitting surface 23 is reflected by the mirror 5 and then displayed on the screen 4.

FIG. 4 shows a second embodiment of the present invention, and the feature of this embodiment is that a large liquid crystal screen 25 is constructed by combining a large number of liquid crystal units. The image displayed on 23 can be displayed enlarged.

Furthermore, FIG. 5 shows a third embodiment of the present invention,
The feature of this embodiment is that a personal computer system 29 consisting of a keyboard 27 and a display 28 is connected to the sketching section 11 via an interface 26. The input data from 29 can be superimposed and displayed on the screen 4.

〔Effect of the invention〕

As explained above, the display device according to the present invention has
It is equipped with a receiving unit section that has a light-transmitting surface, and data can be displayed on the light-transmitting surface by remote control.This not only makes it possible to easily change the content to be displayed on the screen, but also prevents heat and light from the light source. It is possible to eliminate the negative effects of

[Brief explanation of drawings]

FIG. 1 is a perspective view of a display device according to the prior art, FIG. 2 is a perspective view showing a first embodiment of the display device according to the present invention, and FIG. 3A is a specific circuit of the switch section in FIG. 3B is a specific circuit diagram of the receiving unit in FIG. 2, FIG. 4 is a perspective view showing the second embodiment, and FIG. 5 is a perspective view showing the third embodiment. be. 11... Sketching section, 12... Receiving unit section, 13... Input terminal, 14... Pattern input surface, 23... Light transmitting surface, 24... Receiving section. In addition,
In the figures, the same reference numerals are used for the same or corresponding parts.

Claims (1)

[Claims] 1. A sketch having a pattern input surface, an input terminal that outputs a position signal corresponding to a pattern specified by a light member on this input surface, and a transmitter that outputs a signal modulated by the output of this input terminal. a receiving unit section comprising a receiving section that demodulates the output signal from the transmitting section and a light transmitting surface that displays an image corresponding to the pattern based on the output signal of the receiving section; 1. A display device characterized by transmitting light through a light transmitting surface and displaying an image on the light transmitting surface on a screen.