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LCDs pixels have different black to white  (on- time) and white to black (off-time ). This results into  a luminance unbalance   at the reversal instant.
Luminance articfact was not present with previous  CRT technology.

This  example shows a Pattern Reversal Stimulus   using  same LCD,  with and without IngEnesi  VirtualCRT graphic controller.

 In a real test, a simple sheet of paper in front of the display ( the round disk) can reveal the flashing  at every pattern reversal


Traditional LCD graphic controller

IngEnesi VirtualCRT graphic controller