Technology Trends After experiencing the rapid growth of smartphones and tablets, users’ attention on wearable devices is increasing. According to a survey by a well-known organization, IDC, the global shipments of wearable devices in 2014 will exceed 19 million, which is more than three times that of last year. A survey by the Internet Consumer Research Center ZDC also confirmed this view from the perspective of user needs.

A survey conducted by ZDC, an internet consumer research center, on the awareness, use, and future purchases of wearable devices by Chinese IT users in 2014. The results show that among the surveyed population, netizens with smart bracelets accounted for the highest percentage, exceeding 50%; netizens' willingness to purchase wearable devices in the future was concentrated, and smart watches were preferred, followed by smart bracelets. In addition, the survey data also shows the acceptable price range of netizens for their own purchase of wearable devices: For smart watches, more than 50% of netizens are most expected to be under 1,000 yuan, and 37.3% of netizens can accept prices in the price range of 1000-2000 yuan. Smartwatches, while the acceptance of smartwatches with more than 2,000 yuan in smart watches is relatively low; for smart bracelets, armbands and other devices, the price of netizens is expected to be less than 300 yuan. In addition, 60% of Internet users receive smart glasses under 2,000 yuan. From the survey data of ZDC, it is not difficult to see that current netizens have great interest in wearable devices.

The popularity of smart wearable devices is the result of the influence of Internet smart technologies. With the increasing demand for smart wearable devices, technologies for realizing more functions of smart wearable devices have also been gradually excavated.

Recently, researchers at Fukui University in Japan have developed a laser beam combiner that is only a grain of rice, but it can provide screen scanning solutions for smart wearable devices.

This laser beam combiner contains three optical waveguides and three directional couplers. According to researchers, couplers convert one light input to another.

In the picture above, the green light passes through the center of the optical waveguide, and it is a straight line from beginning to end. The other two curved beams are blue and red. Among them, the positional order of the three beams is very important because this will directly affect the efficiency of the final light output.

At the output of the optical waveguide, the three beams are combined to one. In general, the energy of the light passing through this laser beam combiner remains about 96% of the input light. Among them, the output light wave will be kept above 85% according to the output energy of each RGB light beam, and the wavelength tolerance is kept at ±10nm.


The research team used silicon substrates for precision machining to make laser combiner prototypes. They found that the 0.06*7.8mm size would be smaller than traditional mirror-type equipment. In display solutions for wearable devices or other devices, this combiner will be better and more efficient than LCD or laser display screens.

Researchers say that LCD screens will be challenged because of the need to have an overlying, precisely-displayed lens system to use LCD screens for display functions.

The laser display contains a multi-path processor and a beam scanner, which emits RGB light and does not require a focusing system because the image can be obtained directly by laser beam scanning.

In addition to the display area, laser combiners can also be used in other areas, such as wearable devices only for augmented reality.

It is understood that the Fukui University research team will next try minimalist optical device research, such as the use of DC combiner plus RGB semiconductor lasers on silicon substrates.

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