It seems from the history that your husband is having headache along with nausea
for long time.
The size of the screen does not matter but illumination in the room matters.
The condition classically seen after viewing film in dark illumination is an attack of acute narrow angle glaucoma
Hence this has to be ruled out first.
The other condition to be considered is migraine headache
Hence I advice you to consult your doctor for examination and treatment accordingly.