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Apple has opted to transition from using a row of LEDs with a light guide panel, to installing individual LEDs beneath each key.

And behind those keys, we find:

An array of four Texas Instruments TLC5951 PWM LED Drivers

A pair of NXP PCAL6416A I/O Expanders

They claim that this new keyboard design provides even lighting across the whole keyboard, while maintaining a higher level of power efficiency than previous designs.

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