Like its siblings, this 4K display has some control hardware tucked away behind the front panel:

Texas Instruments TPS65168 High Resolution, Fully Programmable LCD Bias

Texas Instruments TPS54320 4.5 V to 17 V Input, 3 A Synchronous Step-Down SWIFT Converter

Texas Instruments TPS54218 4.5 V to 17 V Input, 3 A Synchronous Step-Down SWIFT Converter

Parade Technologies DP665 LCD Timing Controller (the same found in last generation's 27" 5K model)

Texas Instruments NH245 55K G4

Texas Instruments BUF16821 Programmable Gamma-Voltage Generator and Vcom Calibrator