A method of self-turn-off PWM gray-scale control is put forward based on the memory,which controls the pixels′ working condition being on or off separately.The implemented scheme of the system is also put forward.Comparing with the conventional method based on comparators,the new method has the advantages as follows:it not only achieves the same duty cycle and scanning efficiency,but also could decrease the use of system hardware resource,especially in chip area.On the basis of these,it improves...