The most popular thin film scanner at Tokyo Univer

2022-07-26
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Thin film scanner less than 1mm thick at the University of Tokyo

the thin film image scanner developed by the research team of the University of Tokyo can be bent, and the labels on wine bottles can also be scanned. The enlarged resolution of the scanner is 36dpi (the size of each unit is about 0.7mm × 0.7mm)。 Different from the traditional scanner, the optical sensor of the thin-film scanner (lower) is divided into several lattice units. Because it can be bent, it will not cause damage to the books that create miracles for the experimental machine industry during scanning.

the research specialty of the Engineering Department of the Graduate School of the University of Tokyo published a thin-film image scanner using organic TFT (thin-film transistor) and organic optical diode on December 10, 2004. It is made of very thin plastic material and can be bent, so the image printed on the curved surface can be scanned. It is characterized by ultra-thin and light weight. Since it does not need the mechanical device of the traditional scanner, the thickness including the packaging film is less than 1mm

the scanner was jointly developed by the research team led by ryuno Tanya, associate professor of the quantum phase electron research center of the research department of the Engineering Department of the University of Tokyo, and Guikang Sakurai, Professor of the international joint research center of the University. The thin-film scanner is made by making the tiny light sensor composed of organic light-emitting diodes and the organic TFT form a lattice on the plastic film respectively, and then bonding them together. The resolution is 36dpi and the size is 5 ~ 8cm2

the scanner is a thin film type, "almost all are transparent except for metal electrodes" (rangu), which is known to be transparent. When the scanner is placed on the paper or label printed with black-and-white patterns, the light passing through the film will be reflected by the printing surface and will be incident on the light sensor. The pattern can be read by converting the incident light into an electrical signal. In addition to products with a resolution of 36dpi, we have also developed products with a resolution of 250dpi, which do not use organic TFT but only use optical sensors. After wiring on the product with a resolution of 250dpi, the size of 1mm was successfully read in the alphabet × 1mm letter "t". In terms of the sensitivity of the light sensor, "the brightness at a distance of several centimeters from the fluorescent lamp can be used normally" (dye Valley). In terms of relevant technical patents, Sakurai said: "we hope to obtain patents on circuit structure, manufacturing method and application software."

for organic TFT semiconductors, pentacene with high carrier mobility in p-type semiconductors is used. On the other hand, there are few auxiliary equipment configurations for the single drawing machine. On the one hand, the organic photodiode adopts "p-type and n-type organic semiconductors based on blue pigments" (dye Valley), which is formed by the combination of p-type and n-type semiconductors like the existing photodiodes. The above three organic materials are all low molecular materials, which are formed on the plastic film by vacuum evaporation. Plastic material "is similar to 'pet (polyethylene terephthalate)', which is a kind of resin with heat resistance" (dye Valley)

the reasons why the research groups of ryango and Sakurai used organic materials in semiconductors are: (1) it can make organic materials bendable (2) it can be manufactured through printing technology (3) the cost of large-scale production is very low. "We have confirmed that the thin film type made of organic TFT can still work normally when the bending radius reaches 5mm to compare the segregation of inclusions," rangu said In terms of cost, Sakurai said: "the price of 10cm silicon chip is about 100000 yen (about 7700 yuan). The scanner size is 10cm2, and the price should be less than 1000 yen (about 77 yuan)." However, at present, a major problem of the product is that its working life is too short. "The performance of the product developed this time will decline after being stored in the air for about one week. If the packaging technology developed for organic EL is adopted, its performance should be maintained for several months" (rangu)

at the International Conference on circuit technology "ISSCC 2004" held in february2004, rangoo and Sakurai published the "artificial skin" made of lattice pressure sensor and organic TFT pasted on plastic film. In addition, this achievement will also be published at the International Conference on semiconductor components "2004 IEEE International electron devices meeting (IEDM 2004)" held in San Francisco from December 13 to 15, 2004, and the International Conference on semiconductor circuits "ISSCC 2005" held in San Francisco in February 2005

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