Capacitive touch chip applied in the touch screen of smart door lock

Capacitive touch chip is a touch control technology commonly used in the touch screen of smart door locks. It detects the touch input by using the electric field change between the object and the capacitor, and has the advantages of high sensitivity, low power consumption and multi-touch. The following will detail the capacitive touch chip in the smart door lock touch screen application.

Ⅰ, The working principle of capacitive touch chip

Capacitive touch chip is mainly composed of capacitive sensor array, control circuit and drive circuit. When an object on the touch screen approaches, an electric field coupling is formed between the object and the capacitive sensor. The capacitance sensor converts the electric field change when the object is approaching into an electrical signal, which is processed and decoded by the control circuit, and finally the touch position information is obtained.

Ⅱ, The application of capacitive touch chip in the touch screen of smart door lock

1. Touch unlock: The touch screen of the smart door lock realizes the user's touch unlock function through the capacitive touch chip. The user only needs to touch the unlock button on the touch screen, and the capacitive sensor can accurately detect the touch position and transmit the touch signal to the control circuit for unlocking processing.

2. Password input: Capacitive touch chip can also be used to achieve password input function. On the touch screen of the smart door lock, the user can enter the password through the numeric keypad on the touch screen. The capacitive sensor can accurately detect the user's touch input and pass the input password to the control circuit for verification.

3. Fingerprint recognition: Some high-end smart door lock touch screens are also equipped with fingerprint recognition function. Capacitive touch chips can be used to detect the user's fingerprint input. When the user puts his finger on the fingerprint sensor, the capacitive sensor can sense the subtle changes in the fingerprint and pass the fingerprint information to the control circuit for identification.

4. Gesture control: Capacitive touch chip can also realize gesture control function. By detecting the user's finger on the touch screen, such as sliding, scaling and other gestures, the capacitive sensor can accurately capture the gesture information, and pass it to the control circuit for corresponding operations, such as adjusting the volume, switching the interface.

5. Multi-touch: Capacitive touch chip supports multi-touch technology, which can simultaneously detect and track the position and action of multiple touch points. On the touch screen of the smart door lock, the user can use multiple fingers to operate, such as zooming in and out, rotating and so on. Capacitive sensors can capture information from multiple touch points in real time and pass it to the control circuit for processing.

Ⅲ, The advantages and application scenarios of capacitive touch chips

1. Advantages: Capacitive touch chip has the advantages of high sensitivity, low power consumption, fast response and accurate positioning. It can realize the high-precision touch of the touch screen and provide a good user experience.

2. Application scenario: Capacitive touch chip is widely used in smart door lock touch screen, smart phone, tablet computer, car navigation system and other fields. In the smart door lock touch screen, the capacitive touch chip can realize the user's touch unlock, password input, fingerprint recognition, gesture control and other functions, improving the convenience and security of the door lock.

Summary: Capacitive touch chips play an important role in the touch screen of smart door locks. It realizes the functions of touch unlock, password input, fingerprint recognition, gesture control and so on by sensing the user's touch input and gesture action, which improves the intelligence level and user experience of the door lock. With the continuous progress of science and technology, the application of capacitive touch chips in the touch screen of smart door locks will be more and more extensive.