Transfer method, method of manufacturing thin film devices, method of maufacturing integrated circuits, circuit board and manufacturing method thereof, electro-optical apparatus and manufacturing method thereof, IC card, and electronic appliance

Abstract

A transfer method comprising a step of forming a plurality of transferred bodies on a transfer origin substrate, and a step of applying energy to partial regions corresponding to the transferred bodies to be transferred, and transferring these transferred bodies corresponding to the partial regions onto a transfer destination substrate. A plurality of transferred bodies such as devices or circuits that are to be disposed on a transfer destination substrate with spaces therebetween can be manufactured integrated together on a transfer origin substrate, and hence compared with the case that the transferred bodies are formed on the transfer destination substrate directly, the amount of materials used in the manufacture of the transferred bodies can be reduced, the area efficiency can be greatly improved, and a transfer destination substrate on which a large number of devices or circuits are disposed in scattered locations can be manufactured efficiently and cheaply.

Description

[0001] This is a Division of application Ser. No. 10 / 201,268 filed Jul. 24, 2002. The entire disclosure of the prior application is hereby incorporated by reference herein.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a transfer method for devices or circuits, and a circuit board, an electro-optical apparatus, an IC card and an electronic appliance manufactured using the transfer method. [0004] 2. Description of the Related Art [0005] Recently, with regard to the manufacture of electro-optical apparatuses such as liquid crystal electro-optical apparatuses having thin film devices such as thin film transistors (TFTs) or thin film diodes (TFDs), there has been research into various art for reducing the amount of thin film device-constituting material discarded through etching and thus greatly reducing the manufacturing cost of the electro-optical apparatuses. [0006] Conventionally, a method developed by Alien Technology called the...

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Benefits of technology

[0017] According to the transfer method of the present invention, a plurality of transferred bodies such as devices or circuits that are to be disposed on a transfer destination substrate with spaces therebetween can be manufactured integrated together on a transfer origin substrate, and hence compared with the case that the transferred bodies are formed on the transfer destination substrate directly, the amount of materials used in the manufacture of the transferred bodies can be reduced, the area efficiency can be greatly improved, and a transfer destination substrate on which a large number of devices or circuits are disposed in scattered locations can be manufactured efficiently and cheaply.

[0065] The present invention also provides an IC card manufactured using a transfer method according to the present invention. According to the IC card of the present invention, a circuit board provided with devices or circuits that are IC card components is formed using a transfer method of the present invention, and hence the IC card has advantages similar to those of the electronic appliance of the present invention.

Problems solved by technology

However, with this microstructure technique, there is a drawback in that disposing the microstructures on the substrate with certainty and carrying out accurate alignment are difficult.

According to these transfer techniques, functional devices that require a high-temperature process during manufacture can be transferred onto desired substrates, including ones that cannot withstand such high temperatures.

However, with the conventional transfer techniques described above, there have been problems such as the following.

This is surprisingly troublesome, and hence there has been a problem that the manufacturing efficiency is prone to dropping.

Moreover, with the above transfer techniques, all of the thin film devices such as TFTs formed on the transfer origin substrate are transferred onto the transfer destination substrate, and hence the larger the area of the substrate, the better the properties, i.e. the higher the output power, the uniformity and so on, required of the laser light irradiated, and hence it becomes difficult to obtain a laser light source that meets the required performance, and moreover large, high-accuracy irradiation equipment becomes necessary for the laser light irradiation.

Furthermore, if laser light of high output power is irradiated, then there is a risk that the thin film devices may be heated to a temperature above the limit of heat resistance thereof, resulting in the functions of the thin film devices themselves being lost, and hence there has been a problem that the transfer process itself becomes difficult.

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