Abstract
Theoretical problems related to the Brochard-Leger wall in liquid crystals have been further explained. It has been shown that there exists a critical region in liquid crystals beyond which the Brochard-Leger wall does not exist. The relaxation behavior of the wall has been discussed, and the relaxation time has been calculated. The speed of the Brochard-Leger wall has been investigated for the case for which the tilt angle of the external field is equal to a critical angle.