Shirt made with light emitting diode

It seems that they use light-emitting diodes made of fiber. What is this.

Details are as follows.Philips Research Press Releases - Philips illuminates IFA 2006 with production-ready Lumalive textile garments

According to this article, Phillips of the Netherlands has developed a fibrous light emitting diode that does not impair cloth comfort and flexibility. It can display a variety of short text messages, logos, animations, etc. Up to 20 cm square is available, and it can be used for various things such as shirts and sofa covers. Also, in order to make it emit light, a control chip and a battery are necessary, but it seems that it is designed to be removable when washing in emphasis on practicality.

There are movies actually used for various things. Both have the same content.
YouTube - Light-emitting shirts!
Lumalive light-emitting textiles at IFA 2006(Wmv format)
If you are wearing such a shirt and walking in the street at night, you are getting eye catching.