How capacitive touch screen applications handle the noise problem

Touch screen device may in the day by many different noise sources, both internal and external noise noise is also included. Charger and monitor noise is a common problem in today's two most noise sources. As the market becomes more and more devices on the charging light, noise increases, the challenge will only become more difficult to manage. In addition, many other everyday objects will produce noise, causing interference, such as radio signals, AC power and even fluorescent ballasts. In the presence of noise, the low performance capacitive touch system reports position may be distorted, thereby affecting the accuracy and reliability.
Today's touch screen controller uses a variety of methods to improve signal to noise ratio, and filter out the bad from the noise in the data, these methods include on-chip high-voltage transmission signal generation, professional hardware acceleration, high-frequency transmitter, adaptive frequency hopping technology and Saturation control techniques. However, the touch technology continues to sustainable development,lcd module involving aspects include: how to use these features touch controller, how to dynamically adapt to the presence of noise in the system, and how changing environmental conditions and accurate touch tracking.
Injected noise impacts include large jitter (for non-mobile finger touch coordinates reported vary widely), but no finger touching the screen with a finger touch of false positives, do not report when the finger touch finger exist, and may even cause the device is fully lock and so on. If the touch-screen phone, for example, which means you can not unlock the phone (because you can not report a finger manipulation), or due to jitter or false touch while dialing a wrong number (the middle of the night like a friend's phone call, the result was wrong was allocated Boss, this problem is not small). Figure 1 shows the use of the market's best-selling smartphone finger tracking test results obtained (for example, using a finger to draw a circle). As the noise increases, the finger on the panel position reports (as shown in blue) to be wrong, and will detect errors in the panel of the touch (other colors shown).
How to deal with touch screen controller noise, will the quality of the user experience touch UI significant impact. Touch in noisy conditions, poor performance may result in customer dissatisfaction, thereby increasing the amount of return. COG LCD Display Since the difference between the various noise, touch screen controller to be able to detect, differentiate and respond to these noise, especially the two most likely cause of the problem noise sources: charger and display noise.