Optical sensor device and electronic apparatus
US7253391B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2004 |
| Grant date | Aug 7, 2007 |
| Priority date | — |
| Expiry date | Sep 14, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D86/00
Abstract
In an optical sensor device employing an amorphous silicon photodiode, an external amplifier IC and the like are required due to low current capacity of the sensor element in order to improve the load driving capacity. It leads to increase in cost and mounting space of the optical sensor device. In addition, noise may easily superimpose since the photodiode and the amplifier IC are connected to each other over a printed circuit board. According to the invention, an amorphous silicon photodiode and an amplifier configured by a thin film transistor are formed integrally over a substrate so that the load driving capacity is improved while reducing cost and mounting space. Superimposing noise can be also reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.