In recent years, touch screens have become ubiquitous, with virtually all mobile devices, from smartphones to tablets to laptops, featuring some form of touch input. Capacitive multi touch screens have become especially popular due to their accuracy and responsiveness. In this article, we will discuss the process of creating a capacitive multi touch screen panel.
The first step in creating a capacitive multi touch screen panel is to select the appropriate materials. The main components of a capacitive touch screen are a glass substrate, a transparent conductive layer, and a protective layer. For the glass substrate, we recommend using a type of glass known as “soda lime glass,” which is a type of low-expansion glass that is commonly used in the production of touch screens.
The next step is to apply a transparent conductive layer to the glass substrate. There are several materials that can be used for this purpose, including Indium Tin Oxide (ITO), silver nanowires, and graphene. ITO is the most commonly used material for transparent conductive layers due to its high conductivity and transparency. The layer can be deposited onto the glass substrate using a technique known as sputtering, which involves bombarding the substrate with ions.
Once the transparent conductive layer has been applied, the next step is to create the touch sensor pattern. This involves using a photolithography process to create the pattern of electrodes and traces on the transparent conductive layer. This is typically done using a special photoresist material that is applied to the surface of the conductive layer. The photoresist is then exposed to a pattern of light, which causes it to harden in specific areas. The unhardened areas are then washed away, leaving behind the desired pattern.
After the touch sensor pattern has been created, the next step is to apply a protective layer to the touch sensor. This layer is typically made of a material such as glass or plastic, and is used to protect the touch sensor from damage and wear.
The final step in creating a capacitive multi touch screen panel is to calibrate the touch sensors. This involves mapping the touch sensor pattern to the display area of the screen, and determining the sensitivity and accuracy of the touch sensors. This is typically done using software that is designed specifically for this purpose.
In conclusion, creating a capacitive multi touch screen panel involves selecting the appropriate materials, applying a transparent conductive layer, creating the touch sensor pattern using photolithography, applying a protective layer, and calibrating the touch sensors. While this process may seem complex, modern manufacturing techniques have made it easier and more efficient than ever before.