BOE announces the integrated solution of NFC and In-cell touch LCD. This solution integrates the NFC coil inside the LCD screen, enabling card-swiping on a touchscreen without additional components. It provides greatly enhanced user experience with specially designed TDDI technology combining display, touch, and NFC functions.
The solution uses a grid design to integrate the NFC coil on the TFT substrate, eliminating the need for additional mask layers. Metals with higher electrical conductivity are selected to reduce coil impedance, improving antenna performance and signal strength.
This solution also adds a Tx signal line within the pixels, enabling TDDI (Touch and Display Driver Integration) design. Existing under-display NFC solutions on the market cannot solve the interference issue of NFC noises affecting the touch control signal. To address that, BOE adopted a time-division driving scheme that allows the TDDI IC to operate in different modes depending on the strength and duration of the NFC signal. When NFC interference is strong, the TDDI IC avoids NFC and Touch working at the same time. When NFC interference is weak, the TDDI IC adopts a noise filtering algorithm to filter out NFC noises.
