Average power consumption refers to the average power consumption of the touchscreen system. Including the working time of the controller (scanning, processing, communication, sleep, etc.) and the time for the main processor to receive and interpret touch data. Power consumption is a very common performance parameter. In terms of power consumption of the touch screen, there is require a more precise calculation formula. Because different usage modes will produce different power consumption. The standby time of the mobile phone depends on the current consumed in the standby or sleep mode of the touch screen.
When the touch screen is working, there have many modes, for example, wake-on-touch (WOT), cheek detection (Cheek Detect). Such as answering a call for 5 minutes. In the same time, viewing or entering a phone number, the phone may switch to touch mode for up to 10s, and then Then switch to WOT or cheek detection mode to remind the call. Even when sending text messages (SMS), it is still mix WOT mode and actual finger contact. When pressing a button or thinking, the controller will switch between various sleep modes.
If these power consumption modes are not considered. It is easy to be misled by the power consumption of the system. In most cases, the touch screen is switched to cheek detection mode and touch wake-up mode 90% to 99% of the time. Some systems allow users to set the ratio of processing time to sleep mode, even when the finger is still on the panel. If the system only detects that the finger is placed in the same position. It does not need a picture update rate of 200MHz. If you want to develop a high-performance touch screen, you must use a low-power system in sleep mode and work with innovative sleep and wake-up modes.
Finger capacitance refers to the capacitance measured between the finger and a single sensor component. When measuring finger capacitance, we use a real finger to use instead of a metal mechanical finger to ensure that the measured data conforms to the actual situation. The factors that affect the feedback capacitance (CF) include the thickness of the lens covering the upper layer . And the dielectric constant of the material covering the outer layer.
The system noise floor refers to the noise measured at the output of the capacitor-to-digital converter. And is the input (capacitance) value of the data converter.
The signal-to-noise ratio (SNR) is the ratio of the finger signal measured by the sensor to the measured noise. This is an important parameter, and designers must have a deep understanding of it before they can develop a highly efficient touch screen. The system must be able to adjust, adapt and filter out parasitic noise in the mobile system. In order to obtain high signal and very little noise. Consider the use of accurate analog front-end components for the touch screen function.
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