Preventing Common Latency Problems with Projected Capacitive Systems

“Latency”, simply put, is the delay between a user’s input and a computer’s response. It refers to the delay caused as data travels between two physical points (such as between cities or countries) on the Internet. It also refers to other types of computer-based delay. For example, many touch screen devices have a small amount of latency. In some operating environments, or over time, this latency can become more noticeable.

 There are many types of touch screens. The oldest, “resistive” touch screens, are still frequently useful today, but due to their design they require a notable amount of pressure to use. This is why the oldest smartphones and tablets were even bundled with styluses, which provide more precision pressure.

Many years later, enter the projected capacitive system.
By using a layered conductive grid, with a large number of rows and columns, interspersed by layers of glass (including the top layer), a projected capacitive system creates an electrostatic field that tracks every point during an object’s movement across the screen. This helps eliminate latency by creating a touch screen that is extremely sensitive to all levels of pressure and all forms of motion.

Additionally, a projected capacitive system has many of the advantages resistive touch otherwise holds over other capacitive touch systems. Due to the sensitivity of the electrostatic field, it can, for example, be used with a stylus sans pressure or a gloved finger.
The only true risk with a projected capacitive system is placing it in an inappropriate operating environment, such as one with high humidity or heat. As with any device, understanding a projected capacitive system’s capabilities is critical to safely and properly using it.

 

Sources:

Projected-Capacitive Touch Technology, large.stanford.edu

Projected Capacitive Technology , multimedia.3m.com

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