What is capacitive touch?

Capacitive touch is a touch technology based on the changes of electrical charge on the screen when lightly touched by the human hand.

Touch screens are used more and more on electronic devices, we can find touch screens in phones, tablets, laptops even desktop computers or many other devices. . The most popular touch technology today is capacitive touch.

Who brought touch screens closer to humans?

In 2007, Apple made the most important step forward in touch technology: the iPhone launched with a focus on large (at the time) touch screens. The launch of the iPhone completely changed the face of the mobile industry, leading to the launch of other mobile operating systems such as Android and Windows Phone. And the iPhone is also a pioneer in capacitive touch technology.

What is capacitive touch?

Capacitive touch is a touch technology that is based on the changes of electrical charge on the screen when lightly touched by human hands, or by electrically charged objects.

In essence, capacitive touch can be divided into 2 types: One is a single-point touch, which can only receive up to 1 touch during operation. And two is multi-touch. Apple, although not the creator or the first to use capacitive touch, has made the app-touch technology famous and is gradually increasing its market share in touch screen technology.

Structure and operation of capacitive touch screen

Capacitive touch screens use a metal ion-coated glass that allows up to 90% more light to pass through. As a result, the image displayed is clearer. The metal ion layer on the glass surface creates a network of capacitors on the screen. These capacitors will lose charge when touched by human hands or live objects, so that the system containing the screen will determine where this change takes place and proceed to manipulate according to the user’s wishes. . As a result, this type of touch screen can be controlled by very light “touches” from the finger, but usually you cannot use it with hard objects or wearing gloves.

Capacitive touch screens have high accuracy and reliability, making them widely used in today’s phones and tablets. Capacitive touch is no need to apply force on the touch layer, so it is very sensitive and can sense many points at the same time.

Advantages and disadvantages of capacitive touch

Advantage:

+ The screen can be scratched, sweat and dust resistant.

+ Capacitive touch is touch based on the electric charge in the hand and the touch point on the screen, so it is gentler, faster and more sensitive.

+ Can develop multiple points.

+ Long life of the screen.

+ For better brightness.

Defect:

+ High cost.

+ Can’t use hard objects to touch, such as pens, toothpicks…or can’t impact when wearing gloves.

Which devices use capacitive touch technology?

With its fast, sensitive and highly accurate advantages, capacitive touch screens are widely applied in different fields. Besides, the good support of complex operations such as drag, drop, flip and multi-touch also creates the success of this touch technology. In particular, they are the leading touch technology in the world of portable entertainment devices, typically smartphones.

+ On all Apple phone products such as: iPhone , iPad

+ High-end phones of brands such as Samsung , HTC , LG , Oppo , Sony , Asus …

+ Since Windows 8, Microsoft has also developed the operating system with a focus on touch screens, leading to the launch of a series of hybrid laptop models (laptops with touch screens, removable keyboards).

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