Fingerprint recognition began to enter the public field of vision. It was originally widely used in the field of security and smart attendance such as fingerprint punching machines. The popularity in the mobile phone field was attributed to Jobs and his Apple series of mobile phones. At this point, fingerprint recognition has become the basic configuration of mobile phones. With the full-screen craze, fingerprint identification solutions are constantly innovating and breaking through. At the Shanghai MWC show at the end of June this year, Qualcomm brought new technology to the show, and the mobile phone manufacturer vivo in the United Nations showed its third-generation ultrasonic fingerprint recognition technology. At the World Mobile Congress (MWC2017) at the end of February this year, Huiding Technology has also used the Samsung Galaxy S7 Edge to demonstrate the optical fingerprint unlocking technology that can be unlocked by directly pressing the screen with a finger, and caused a heated discussion in the mobile phone circle. Especially with the advent of the full screen era, optical fingerprints are more popular in the industry. From the principle point of view, optical fingerprint unlocking actually uses the refraction and reflection of light, placing the finger on the optical lens, and the finger is directed from the bottom to the prism under the illumination of the built-in light, and the emitted light is expressed according to the fingerprint texture of the mobile phone. The dark representation is different, and all unique features of the fingerprint are identified by the coupled coupling device. According to the author's understanding from the supply chain, many fingerprint chip companies are currently developing and distributing the optical fingerprint market, including Shanghai Hao, Xinsi, Huiding, etc. In the second half of last year, Xinsi invested in Shanghai. Although many fingerprint chip markets are currently in the market, overall, there is still a long way to go from mass production! Nowadays, more and more mobile phone brands are beginning to introduce optical fingerprint unlocking technology. vivo has been unlocked by optical fingerprints to create new products for themselves. The domestic brand giant Huawei has also been exposed to its in-screen optical fingerprints in its new products Huawei P11 and Huawei mate11. + Powerful device for iris recognition. Why can optical fingerprint unlocking cause attention now? First of all, optical fingerprints have the following advantages and can be adapted to the needs of a full-screen mobile phone. Optical fingerprint recognition penetration capacity of up to 1200-1500um, no external slotting or other processes to help it unlock, eliminating the space reservation of the original home button, the entire screen is clean and generous, the front image of the phone is more beautiful. Another advantage is that the optical fingerprint is fast and accurate. The optical fingerprint unlocking on the screen is a hidden unlocking method. Although it is necessary to keep the screen area of ​​the original home button under the screen for the unlocking of the screen fingerprint, it can be achieved. The moment you press the screen, the unlock is successful. Secondly, the arrival of the comprehensive screen era has put forward new requirements for fingerprint chip manufacturers, in line with the needs of technological innovation. In the fiercely competitive and even fierce mobile phone industry, the first to introduce mature full-screen products is a proof of its own technical strength and product differentiation. In short, who can take the lead in mastering breakthrough technology, who can stand out in the homogenized mobile phone market and occupy a favorable position in the market. As a relatively young fingerprint identification product, the on-screen optical fingerprinting solution has received the attention of many manufacturers. It is reported that many companies including Apple, Samsung, vivo and Huiding Technology are actively researching and developing. Driven by a number of well-known mobile phone brands and chip module manufacturers, more manufacturers will be forced to apply optical fingerprints. What are the difficulties in the popularity of optical fingerprints? Since the optical fingerprint recognition module has a large block size, it generally takes up a lot of space, and its power consumption is relatively large, which is the main reason why optical fingerprint unlocking is less applied in electronic terminals such as mobile phones. With the advancement of technology, the above is no longer the difficulty of popularizing optical fingerprinting. The new difficulties are slowly emerging... The optical fingerprinting device has a poor fingerprint image collection effect on the finger of the dirty finger and the dry finger surface, resulting in a low recognition rate and poor adaptability to environmental factors such as temperature and humidity. Due to the limitation of the fingerprint collection principle, the optical fingerprint collector is difficult to collect clear fingerprint images on the dry fingers, which causes the problem that the recognition rate of the dry finger is low. The successful application of optical fingerprints is closely related to the role of light. However, under strong light conditions, especially under direct sunlight, optical fingerprint recognition is difficult. As with sufficient brightness, insufficient brightness is also not conducive to the realization of optical fingerprint unlocking, but It is pointed out that under the limitation of the optical path, the size of the distortion-free collector is large, and optical distortion and trace residue are usually caused. Therefore, it is particularly important to pay attention to the light source and optical path design. However, the optical fingerprint unlocking may be caused by the thickness deviation of the module, and some of the light is difficult to penetrate, resulting in the failure of fingerprint recognition. Secondly, the technology also has certain requirements on the material of the mobile phone screen, and the fingerprint is placed under the glass cover. The solution can only be used for AMOLED screens, LCD screens can't do it because the noise is too loud. In addition, the use of optical fingerprint unlocking technology requires a reasonable layout, coordinating the design of the comprehensive screen glass, miniaturization of the camera, miniaturization of the earpiece, design of the new fingerprint chip, etc., it takes a certain time to complete and improve. Therefore, mass production is still a major difficulty in the popularization of optical fingerprint unlocking technology at this stage. The ship power plant is the power equipment set up to ensure the normal operation of the ship. It provides various energy for the ship and uses the energy to ensure the normal navigation of the ship, the normal life of the personnel, and the completion of various operations. Ship power plant is all the machinery and equipment for the generation, transmission and consumption of various energy, and it is an important part of the ship. 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