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Touch controller supports AMOLED energy-saving displays

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By Jean-Pierre Joosting

The FingerTip FTG2-SLP touchscreen controller from STMicroelectronics enables advanced features to support the latest active-matrix organic light-emitting diode (AMOLED) displays that promise more power saving and extended runtime in smartphones.

Low-temperature polycrystalline oxide (LTPO) AMOLED displays, and similar proprietary equivalents, dynamically control the display refresh rate according to usage. While refreshing more slowly with the less demanding apps and reserving higher refresh rates for tasks like gaming and streaming, the display driver minimizes power consumption and assures great user experiences.

The FingerTip FTG2-SLP controller supports both synchronous and asynchronous display operations. This gives the OEMs the ability to maintain seamless user interactions as the refresh rate changes dynamically. The controller is also ideal for smartphones with flexible AMOLED displays that integrate the touch-sensitive panel directly on the OLED emitter layer for an extremely thin profile.

The FingerTip FTG2-SLP provides an optimal mix of low power, small size, low external part counts and versatile features with unmatched true multi-touch performance in a single-chip touchscreen controller for thin flexible embedded display-touch panels. It uses a dedicated differential architecture with capacitance to current acquisition engine to implement the touch sensing. Coupled with the internal processor the Fingertip touchscreen controller can detect, classify and track 10 fingers touch with fast report rate and response times with a configurable channel matrix consisting of total 21 TX and 40 RX channels.

Based on an Arm® Cortex®-M4 core and integrating large flash memory, the FingerTip FTG2-SLP provides full flexibility to implement advanced touch features. In addition, proprietary hardware and firmware developed by ST and a special hibernation mode ensure extremely low power consumption that further contributes to maximizing battery lifetime.

The chip’s analog front end (AFE) leverages a differential architecture and multiple scanning methods to ensure faultless touch detection. The internal design also ensures very low intrinsic noise, delivering a high signal-to-noise ratio. The report rate of 480 Hz captures every touch event even when operating at the display’s highest refresh speed.

The FingerTip FTG2-SLP touchscreen controller is in production now.

www.st.com/FRG2-SLP


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