What is a capacitive touch switch?

Release date:

2020-10-17

　　According to the switching principle, touch switches are categorized into resistive touch switches and capacitive touch switches. Among various technologies, capacitive touch sensing has become the mainstream approach in touch sensing technology. In keypad designs, this technology can significantly enhance the overall aesthetic appeal of a product. So, what exactly is a capacitive touch switch?

 

　　The capacitive inductive touch switch can penetrate insulation material casings up to 20 mm thick (such as glass or plastic), accurately detecting the effective contact points of fingers. This ensures that the product's sensitivity, stability, and reliability remain unaffected by changes in environmental conditions or prolonged use, while also providing strong resistance to water ingress and interference. It is understood that multi-touch technology encompasses various approaches; however, the following four methods are currently considered the most mature:

 

Thin-film switch

 

1. "LLP (Laser Plane) Technology" primarily uses infrared laser equipment to project infrared light onto a screen. When the screen is obstructed, the infrared light reflects back, and a camera positioned beneath the screen captures the direction of the reflection. Through system analysis, the device can then respond accordingly.

 

2. "FTIR technology" incorporates LED lights into the middle layer of the screen. When a user presses the screen, it causes varying reflections of light between the layers. The sensor detects these changes in light and accurately captures the point of force applied by the user, enabling the device to respond accordingly.

 

3. "Touchlight Technology" utilizes a projection method, employing infrared projection onto the screen. When the screen is obstructed, the infrared light reflects back, and a camera positioned beneath the screen captures the direction of the reflection. The system then analyzes this data to generate an appropriate response.

 

4. "Optical Haptics Technology," which features a lens at each end of the screen to capture changes in user gestures and the position of touch points. After computation, these coordinates are converted into positional data and then used to trigger corresponding responses.

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