According to iFixit, an unknown microchip is located inside your iPhone X.
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“There is an incomprehensible chip between the Taptic Engine and the bottom speaker,” wrote iFixit. It is shown in the picture below. Maybe this is a special circuit connected to a wireless charging coil?
It could be assumed that the display driver is written on it, but it is associated with the speakers; In addition, the STMicro chip performs this function.
In the end, the mysterious chip turned out to be a Broadcom touchscreen controller under the number BCM15951B0KUB2G.
The mystery is solved!