Advance to develop "Laser TV" with higher image quality than liquid crystal and plasma TV, green semiconductor laser appears

While liquid crystal televisions are projecting images by passing white light through a color filter, higher image quality is realized by hitting red, blue, and green laser light directly on the screen"Laser TV" appeared last SeptemberIt seems that it was difficult to generate green laser light.

And it became clear that a technology to generate a purely green semiconductor laser was developed this time. In addition, it seems that it will be possible to install ultra small projector on cellular phone by this technology.

Details are as below.
Sumitomo Electric Industries, Ltd. | Press Release 2009 World's First Pure Green Semiconductor Laser Oscillated Successfully

According to this release, Sumitomo Electric Industries has succeeded in developing a pure green semiconductor laser with an oscillation wavelength of 531 nm that can directly oscillate from a semiconductor.

Products such as laser televisions and laser projectors using laser light sources have higher brightness and higher definition than conventional ones, as well as features such as small size, light weight, and low power consumption, the development aimed at commercialization is currently Although it is becoming active, although red and blue were realized by semiconductor laser, green was able to realize only by converting the wavelength with a special optical crystal with blue laser.

Moreover, conversion of wavelength from blue to green greatly degrades the light emission efficiency, the wavelength is fixed, parts for converting are necessary, so there was a problem of high cost , The green semiconductor laser developed this time can emit light at low cost and high efficiency, and can cover almost all the green wavelength range.

This is a green semiconductor laser.


According to the link below, it is said that it will be possible to develop ultra small projectors that can be mounted on mobile phones, portable computers, etc. by using this technology.

Sumitomo Electric Industries shares soared, developed the world's first pure green semiconductor laser - Technical strength evaluation | Bloomberg.co.jp: Japan