# Optical sensors

## System definition

* Contact Image Sensor (CIS) = device that detects and converts light rays into electrical signals.
* Most common type of sensor used in modern digital devices

### What is it used for?

* smartphones, tablets, cameras, etc.

### Are they different types and technologies?

2 main types :

* Charge-coupled device (CCD)
* Active-pixel sensor (CMOS sensor) -> cheaper, low electricity consumption


## Life cycle

### Manufacturing

#### What is it made of?

TBC

#### How is it manufactured?

TBC

#### Who are the main manufacturers?

TBC

#### Where are they located?

TBC


## Environmental footprint

### What are the main environmental impacts associated to the materials?

TBC

### What are the main environmental impacts associated to the manufacturing processes?

TBC

### What are the potential parameters affecting environmental impact?

TBC


##  Next steps

### What do we know we don't know?

TBC

### What are the identified challenges?

TBC

### What paths/ideas should be explored?

TBC