The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 10, 2009
Filed:
May. 12, 2006
Jun Koyama, Sagamihara, JP;
Hiroyuki Miyake, Atsugi, JP;
Kei Takahashi, Atsugi, JP;
Kazuhiko Miyata, Habikino, JP;
Jun Koyama, Sagamihara, JP;
Hiroyuki Miyake, Atsugi, JP;
Kei Takahashi, Atsugi, JP;
Kazuhiko Miyata, Habikino, JP;
Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;
Sharp Kabushiki Kaisha, Abeno-ku, Osaka, JP;
Abstract
D/A conversion having higher accuracy is provided by improving relative accuracy of the resistance value of resistors which configure a resistor string. A manufacturing method of a D/A converter circuit of the invention comprises the steps of: forming a resistor stringwhich includes a plurality of resistors Rto Rconnected in series with each other between reference voltages, and a plurality of switching elements Sto Sconnected with each connection node of the resistors Rto R, wherein: each of the resistors Rto Ris a thin film element crystallized by linear laser irradiation; disposing all forming parts of the resistors configuring the resistor stringwithin a laser irradiation area; and crystallizing all the forming parts of the resistors which are disposed within the laser irradiation area with the same laser shot.