The technology principle of sub-row driving gray-scale modulation was introduced and was used in FED video displaying system. The low grey enhancement modulation focuses on the problem that the rising edge and falling edge duration during the row scanning pulse will result in the invalid column driving pulse and no luminescence screen

it causes the data loss of the low grey image which affects the display effect. By adjusting the display order of those sub-rows

and the timing order

eliminating the low grey information loss

the image quality can be improved. At the same time

because the low grey loss caused by the reaction time is existed in the display panel

the low grey loss is modified by the time compensation

so that the display quality of the image is improved. Combined with the human visual characteristics

the image enhancement technology based on the sub-row driving was proposed to improve the video image quality

and applied to the sub-row driving of FED

making the contrast of the video image increased

the image quality more delicate

closer to the human visual effect.