Decrypting the four techniques of super sensitive touch IC chip

    So, in practice, how does Touch IC chip companies achieve these functions? In addition to minimizing leakage in the process of chip hardware design, Xiaobian combines some experience in the industry to summarize the following methods.

    Multiple frequency drives can simultaneously detect the change rate of capacitance in the operation area at different frequencies, and then integrate these different touch responses to improve the recognition ability of the touch screen to the touch objects, which is to improve the resolution of the IC. In the process of practical application, it is also easier to distinguish the interference noise generated by other external surface objects through screening at different frequencies, such as water marks, wet cloth, etc., and at the same time, it can also improve the 3D recognition height of touch and realize the 3D handwriting function.

    Multiple voltage drives, in fact, add the so-called high voltage drive. The high-voltage part of the device can automatically filter out the interference noise generated by some low-voltage components through the voltage limiting circuit, such as the noise of the power charger, GRS noise, WIFI noise, and other peripheral electronic devices. At the same time, the high-voltage drive can share the frequency signal generator of the motherboard itself, thus improving the response speed.

     The time-sharing drive can greatly reduce the interference of the display device to the touch screen by staggering the pulse peak value sent by other electronic components. It can obtain good application effect in ONCELL, INCELL and the MEL MASH touch technology with low resistance and low capacitance.

     Momentum vector tracking

     Momentum vector tracking, in fact, is one of the techniques for processing hand gestures and original handwriting. By tracking the direction of the momentum vector of the capacitance change coordinates, you can predict the direction of the hand gesture. Then, through the change of the capacitance, you can feedback the shape of the object touched by the capacitance. The combination of the two can reproduce the original handwriting or gesture action. At the same time, momentum tracking can also eliminate other noises according to the tracking regularity, which is a good way to accurately detect touch actions.

    A good touch IC often combines one or more of the above methods with OS or UI interface optimization to improve the performance of the entire touch system and give users a more complete and beautiful operating experience.