Electrochromic panel transmission level synchronization

A controller with transmission level synchronization for electrochromic devices, comprising:

• a memory, configurable to hold a plurality of transfer functions for tint level relative to drive of electrochromic devices;
• and
• one or more processors configurable to couple to at least a first electrochromic device and a second electrochromic device and to perform a method comprising:
• consulting a first transfer function for the first electrochromic device, and a second transfer function for the second electrochromic device;
• and
• driving the first electrochromic device in accordance with the first transfer function, and the second electrochromic device in accordance with the second transfer function, to coordinate tint level or rate of change of tint level of the first electrochromic device and tint level or rate of change of tint level of the second electrochromic device.

A method of controlling tint for a plurality of electrochromic devices, performed by a control system, comprising:

• receiving a request to change tint level or color hue of a plurality of electrochromic devices;
• consulting transfer functions for color hue relative to drive for each of the plurality of electrochromic devices;
• and
• driving each of the plurality of electrochromic devices in accordance with the transfer functions, so as to coordinate color hue across the plurality of electrochromic devices.