JPH09233025A - Optical information transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily attain a high transmission speed of information. SOLUTION: Input data inputted as a bit stream of serial data are sent to an SP shift register 11 of an optical transmitter 1, in which the data are converted into data sets of 3 bits each and they are fed to a modulation circuit 12. Then the modulation circuit 12 generates a drive signal to light up in a corresponding color or extinguish a color monitor 13. Then the color monitor 13 is lighted or extinguished depending on a received drive signal. The light of the screen of the color monitor 13 is made incident to a light receiver 2, in which the light is decomposed into lights of each color and made incident into a sensor circuit 22. The sensor circuit 22 converts the presence/absence of the incident light into an electric signal, it is inputted to a PS shift register 23, from which the signal is outputted sequentially as serial data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information transmission device that uses light as a means for transmitting information, and relates to an optical information transmission device for transmitting information by simultaneously using lights having two or more wavelengths.

[0002]

2. Description of the Related Art Heretofore, various portable information terminals and the like which transmit information by infrared rays or visible light have been known as means for using light as means for transmitting information. In this type of device, information is transmitted by emitting / receiving infrared light modulated by information and demodulating it. Alternatively, the brightness of the monitor screen of the personal computer is modulated by the information to be transmitted,
Some portable information terminals detect the change in light and transmit information.

[0003]

However, these devices have a limitation in transmitting information at high speed. In the case of transmitting information at high speed, the former method has a problem in that the modulation circuit, the light emitting and light receiving circuits are complicated and the cost becomes high.

Further, in the latter case in which the monitor screen is brightness-modulated, the transfer rate of information is limited by the number of screens per second, and information in excess of the number of screens per second cannot be transmitted in principle. There was a problem.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to increase the information transmission speed in an optical information transmission device with a simple structure.

[0006]

In order to achieve this object, an optical information transmission device according to claim 1 of the present invention is an optical transmission device which converts information into two or more lights having different wavelengths and sends the information. And an optical receiving device that receives the light sent from the optical transmitting device as the information. That is, two or more pieces of information are simultaneously transmitted by a plurality of lights.

According to another aspect of the optical information transmission device of the present invention, the optical transmission device has a serial-parallel conversion device for converting a serially input bit stream into parallel bit information, and the parallel bit information has serial bits. An optical receiving device having a parallel-serial converting device for converting into a stream. A serially input bit stream is converted to parallel by a serial-parallel converter and simultaneously transmitted as light having different wavelengths. The light receiving device receives the light of a plurality of wavelengths, serial-converts it by the parallel-serial converter, and outputs it.

Further, the optical information transmission device according to the present invention is an optical transmission device having a color monitor capable of outputting light of three wavelengths of R (red), G (green) and B (blue), and the optical transmission device. And a light receiving device having a sensor capable of detecting light of each wavelength. Information transmitted is R (red), G
It is transmitted by the three lights of (green) and B (blue).

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the optical information transmission device of this embodiment comprises an optical transmission device 1 and an optical reception device 2.

The optical transmitter 1 comprises an SP shift register 11 as a serial-parallel converter of the present invention for performing serial-parallel conversion, a modulation circuit 12 and a color monitor 13. The modulation circuit 12 includes a red modulation circuit 12R, a green modulation circuit 12G, and a blue modulation circuit 12B.
It is composed of

The optical receiver 2 includes a color filter 21 and
It is composed of a sensor circuit 22 as the sensor means of the present invention and a PS shift register 23 as the parallel-serial conversion device of the present invention which performs parallel-serial conversion.

The color filter 21 includes a red filter 21R for selectively transmitting only red light, a green filter 21G for selectively transmitting only green light, and a blue filter 21B for selectively transmitting only blue light. Composed of and.

The sensor circuit 22 includes a red sensor circuit 22R which converts the light transmitted through the red filter 21R into an electric signal,
It is composed of a green sensor circuit 22G that converts light that has passed through the green filter 21G into an electric signal, and a blue sensor circuit 22B that converts light that has passed through the blue filter 21B into an electric signal.

Next, the operation of the optical information transmission device of this embodiment will be described with reference to FIGS. First, the operation of the optical transmitter 1 will be described. FIG. 2 (a),
As shown in (b), the input data, which is input as a bit stream of serial data, is data of 3 bits each by the SP shift register 11.
Converted into R, DataG, and DataB, the modulation circuit 12
Sent to DataR is the red modulation circuit 12R
aG is for the green modulation circuit 12G, and DataB is for the blue modulation circuit 1
2B respectively.

Here, the transfer rate of the input data to the SP shift register 11 is set to three times the frequency Vf of the vertical synchronizing signal Vs of the color monitor 13. Further, the output of the SP shift register 11 is synchronized with the vertical synchronization signal Vs by the synchronization means, which is not shown and described.
In FIG. 2, the 3-bit data input to the SP shift register 11 in the interval t0 is Da in sequence in the interval t1.
It is output as taR, DataG, and DataB. That is, since 3-bit data of 101 is input in the interval of t0, DataR = 1, Data in the interval of t1.
That is, aG = 0 and DataB = 1.

Each of the modulation circuits 12 generates a drive signal for emitting or extinguishing the color monitor 13 in the corresponding color depending on whether the transmitted data is 1 or 0. That is, the red modulation circuit 12R outputs a DriveR signal for controlling the red light emission of the color monitor 13, and the green modulation circuit 12G and the blue modulation circuit 12B similarly control the green and blue light emission of the color monitor 13. The DriveG signal and the DriveB signal are output. The color monitor 13 receives the input Dr
It emits light and turns off in response to the iveR, DriveG, and DriveB signals. That is, in FIG. 2, at t1, it becomes yellow,
The color monitor 13 emits red light at t2 and white light at t3. At this time, the color monitor 13 performs full surface light emission in a predetermined color in synchronization with the vertical synchronization signal Vs. It should be noted that instead of the entire surface emission, only a predetermined area may be made to emit light.

The input data is input at a speed three times as high as the frequency of the vertical synchronizing signal Vs, but since it is converted into parallel data of 3 bits by the SP shift register 11, the transfer speed is 3/3. The frequency becomes 1, which is the same as the frequency of the vertical synchronizing signal Vs, and 3-bit parallel data is transmitted for each image. Figure 2
(B) and (c).

Next, the operation of the optical receiver 2 will be described. The light receiving device 2 is appropriately arranged with respect to the color monitor 13 so that the light on the screen of the color monitor 13 can be received. Therefore, the light on the screen of the color monitor 13
It is incident on the optical receiver 2. The incident light is separated by the color filters 21R, 21G, and 21B into lights of R, G, and B colors, and the lights separated into the respective colors are red sensor circuit 22R, green sensor circuit 22G, and blue sensor circuit 22 respectively.
B is incident. In each sensor circuit, the presence or absence of incident light is converted into an electric signal by a well-known photoelectric conversion circuit, and the electric signal is output as SenseR, SenseG, and SenseB signals, respectively.

These SenseR, SenseB, S
The enseG signal is input to the PS shift register 23 and sequentially output as serial data. This state is illustrated in FIGS. 2 (d) and 2 (e). Here, in the section of t1, SenseR = 1, SenseG = 0, S
Since enseB = 1, the PS shift register 23 outputs 101 serial data in the period of t2.

Also in the subsequent sections, similarly input data is transmitted by 3 bits by each screen.

As described above in detail, in the optical information transmission device of the present embodiment, the information is transmitted by the light of a plurality of wavelengths, so that the information can be transmitted at high speed.

The present invention is not limited to this embodiment, and various modifications can be made without departing from the scope of the present invention.
For example, in the present embodiment, the optical transmission device is configured by the modulation circuit and the color monitor, but software for performing modulation or a liquid crystal display may be used. Also in the light receiving device, a color sensor capable of detecting light of a plurality of wavelengths may be used instead of the combination of the color filter and the sensor circuit. Further, in the present embodiment, the information is transmitted depending on the presence / absence of transmitted light, but it may be transmitted according to the intensity of light.

[0024]

As is apparent from the above description, according to the optical information transmission device of the first aspect of the present invention, information is converted into two or more lights having different wavelengths and the information is transmitted and received at the same time. Therefore, data can be transmitted at high speed.

According to the optical information transmission device of the second aspect, since the optical transmission device includes the serial-parallel conversion device and the optical reception device includes the parallel-serial conversion device, serial input is performed. There is an effect that data can be transmitted at high speed.

Further, according to the optical information transmission device of the third aspect, a color monitor capable of outputting light of three wavelengths is used for the optical transmission device, and each of the three wavelengths of light can be detected for the optical reception device. Since the sensor is provided, there is an effect that it is possible to transmit information three times as many as the number of images per second.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an optical information transmission device according to an embodiment.

FIG. 2 is a timing chart explaining the operation of the optical information transmission device according to the present embodiment.

[Explanation of symbols]

 1 Optical Transmitter 11 SP Shift Register 13 Color Monitor 2 Optical Receiver 22 Sensor Circuit 22R Red Sensor Circuit 22G Green Sensor Circuit 22B Blue Sensor Circuit 23 PS Shift Register

Claims (3)

[Claims] 1. An optical information transmission device using light as means for transmitting information, comprising: an optical transmission device that converts information into two or more lights having different wavelengths and sends the information; and the information sent from the optical transmission device. An optical information transmission device, comprising: 2. The optical transmitter includes a serial-parallel converter that converts a serially input bit stream into parallel bit information, and the optical receiver converts the parallel bit information into a serial bit stream. The optical information transmission device according to claim 1, further comprising a parallel-serial conversion device. 3. The optical transmitter is R (red), G
2. A color monitor capable of outputting light of three wavelengths (green) and B (blue), and the light receiving device has a sensor means capable of detecting light of each of the three wavelengths. Alternatively, the optical information transmission device described in 2.