panel segment signals s 1 s 160 are the control signals for displaying the image and the sub panel segment signals d 33 d 128 are the same as the main panel segment signals s 33 s 128 in this case however the main panel common signals cl c 128 are used so as to continuously and sequentially scan the main panel 40 while the sub panel common signals c u2032 1 c u2032 96 are kept at high level to turn off the sub panel 50 therefore only the main panel 40 displays the image fig1 shows the signals produced by the controller chip 44 of fig7 when the main panel 40 is turned off and the sub panel 50 is active likewise the main panel segment signals s 1 s 160 are the control signals for displaying the image and the sub panel segment signals d 33 d 128 are the same as the main panel segment signals s 33 s 128 however in this case the main panel common signals c 1 c 128 are kept at high level to turn off the main panel 40 while the sub panel common signals c u2032 1 c u2032 96 are used so as to continuously and sequentially scan the sub panel 50 therefore only the sub panel 50 displays the image fig1 shows the signals produced by the controller chip 44 when the main panel 40 and the sub panel 50 both are turned off the segment signals s 1 s 160 and d 33 d 128 all are keep at low level e g zero voltage and.