US Patent 10417964 Display with redundancy

A display with an array of pixels may be provided with redundant pixel control circuits. Switching circuitry may be used to couple pixel control circuits to light-emitting diodes for the pixels. The switching circuitry can be configured using control signals from non-volatile memory in decoder circuitry such as thermometer code decoder circuitry. During manufacturing, the display may be inspected for defects. Defective pixel control circuits can be replaced with redundant pixel control circuits so that the display operates satisfactory. The decoder circuitry may supply control signals to the switching circuitry to switch redundant pixel control circuitry into use while bypassing defective pixel control circuits.