When you use your cell phone or POS device, have you ever wondered why you could control them by touch LCD screen? Yes, capacitive touch screen technology can achieve these functions.

What is capacitive touch?

In capacitive touchscreen, glass panel of LCD is covered with a capacitive layer with a static charge. When we touch the screen with finger or conductive stylus, some of the charge shifts from the device to the finger/stylus. This decreased charge is noticed by the controller. And the system will be able to figure out the exact location of touch.

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Benefits of capacitive touch

Comparing with other LCD touch screen technologies, TFT LCD capacitive touch screen brings up these advantages:

• Sharp image with better contrast - devices using capacitive touch screen have extraordinary picture quality thanks to their use of a glass layer. It can transmit 90~98% LCD's light.
• Sensitive to touch - unlike resistive touch screens, which need pressure to pinpoint a touch, capacitive touch screens can sense a slight conductive object's touch. And it can detect multiple touch points.
• Incredible durability - the top glass layer makes the capacitive touch panel extremely durable and reliable, especially when comparing with resistive touchscreen. Cracked capacitive touch screen continues to function.
• Easy to clean - TFT LCD capacitive touch screens come with a sturdy glass top layer. It is easier to clean and is not impacted by dirt, rain, grease or dust. It makes capacitive touch screens very well suited for long term use.

Here is an example of how to implement LCD capacitive touch screen.