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Illuminating light communication system and transmitting device for illuminating light communication

A technology for lighting optical communication and sending devices, applied in lighting devices, transmission systems, short-distance systems, etc., can solve the problem of low response speed and achieve the effect of data writing

Inactive Publication Date: 2010-03-03
SUMITOMO CHEM CO LTD
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  • Abstract
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Problems solved by technology

[0006] However, there is a limit to high-speed transmission (transmission) of large-capacity optical data in illumination light communication using white LEDs.
This is due to the low response speed of white LEDs compared to semiconductor lasers used in optical fiber communications, etc.
As white LEDs for lighting, types using phosphors are mainly used, but this type has a lower response speed than LEDs that do not use phosphors

Method used

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  • Illuminating light communication system and transmitting device for illuminating light communication
  • Illuminating light communication system and transmitting device for illuminating light communication
  • Illuminating light communication system and transmitting device for illuminating light communication

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Embodiment Construction

[0039] The main characteristic point of this embodiment is that organic EL is used as the light source for illumination in illumination light communication. Organic EL has advantages such as free size design, ultra-small size, and high-speed response. In general, organic EL having a small area of ​​each element is preferable for use in illumination light communication. This is because the capacitance proportional to the area of ​​the light-emitting element defines the RC time constant of the element, so the smaller the RC time constant (that is, the smaller the area), the higher the response speed. Preferred element area (light emitting area) 10 -8 cm 2 Above and 1cm 2 Below, more preferably 10 -8 cm 2 Above and 10 -1 cm 2 Below, especially preferably 10 -8 cm 2 Above and 10 -2 cm 2 the following. In conventional LEDs, after forming a light-emitting element on a semiconductor substrate, the semiconductor substrate is divided into sheets, and the sheets are mounted ...

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Abstract

The present invention is directed to providing a new illuminating light communication system capable of transmitting large-capacity data at high speed. A transmitting device 1 emits light modulated depending on data to be transmitted from an organic EL light source 4. A receiving device 2 receives the modulated light emitted from the organic EL light source 4 and converts the received modulated light into an electric signal, and demodulates the data from the electric signal obtained by the conversion.

Description

technical field [0001] The present invention relates to an illuminating light communication system that transmits data by using illuminating light, and a transmitting device for illuminating light communication. Background technique [0002] With the advancement of high-speed communication technology, indoor wireless communication technology using light is increasingly utilized. In particular, LANs (Local Area Networks) using infrared rays are widely used in offices and homes. However, in infrared communication, there is often a problem that communication is affected by a shield between the transmitter and receiver, and communication is difficult to stabilize due to low signal power. [0003] As a communication method that solves such problems of infrared communication, a communication method using illuminating light can be considered. As a light source for illumination light, a compound semiconductor-based white light-emitting diode (hereinafter referred to as a white LED...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/10H01L51/50H04B10/105H04B10/22H05B37/02H04B10/11H04B10/116
CPCH05B37/029H04B10/116H05B47/155H04B10/50H04B10/60
Inventor 小野善伸
Owner SUMITOMO CHEM CO LTD
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